This goes to something really important that many people overlook. Mental health is poorly understood in most places and by most people. Those who have not had major depression tend to believe that people who are suicidal are weak, lack courage, attention seeking, and ultimately selfish. They are unable or unwilling to empathize.
This is where public health education has largely failed in many countries. Major depression is an actual physical illness. The brains of those with major depression do not functioning normally. Chemical compositions and secretions becomes altered and these changes can radically change a person's personality and thought processes.
The mind of a person suffering from major depression is subject to the effects of the disease. Suicidal ideation is but one of a number of symptoms brought about the chemical changes that take place because of the disease. To judge sufferers of major depression by the standards you would judge a healthy person is cruel. It's like saying someone with cerebral palsy only uses a wheel chair because he is lazy. Perhaps this is because it's difficult to understand that those with major depression have anything wrong with them; that their thought processes are the same as those without the disease. Sufferers can look as healthy as anyone else. You cannot see the changes the disease has caused in any other manner except through behavior and affect save via MRI imaging and nobody I know has an MRI or a radiologist qualified to read the results in their living room.
It's essential to understand that the thinking of people with major depression is always under the influence of the disease. When depressed people speak, it is through the veil of the disease. When depressed people act, the impetus is sparked by the disease. The person one once knew is being changed by an insidious series of chemical changes that make normal judgement difficult to impossible. It is not easy to be a friend or family member living with a person suffering from major depression. Interactions are often frought with anger and apathy. The level of frustration with the depressed person can be so intense that the people the sufferer needs are driven away just when the sufferer needs them most. Being supportive of the ill not easy no matter what the problem is and sufferers of major depression tend not to get the support they need because those around them fail to recognize that they are interacting with a disease and not the person being controlled by it.
Not all pharmaceutical therapies work for all people. Some do not work at all. The brain is still the most poorly understood organ in the human body and there is no way to know which drug or therapy will work for which person until it is tried. Sometimes all it takes is a course of drugs to correct major depression. Sometimes other therapies like cognitive or Freudian analysis work best. Other times the only thing that works is electroconvulsive therapy (ECT).
There is debate over whether psychotherapy is useful or not. It can be for some people. Humans, unlike nearly all other animals, can cause their minds to do things voluntarily. In doing so we subconciously use chemical neuro transmitters to access the thought we want. If I want to imagine a green cube I can do so. That is using my brain's chemistry willfully. Therapy can similarly stimulate the person with major depression to gradually rebalance the brain's chemical process by forcing it to excrete the necessary balancing chemicals via patterned thought processes. It may not work all the time, no psycho or chemical therapy does, but it is a useful tool to complement psychopharmeceuticals and can enhance their effectiveness.
Even now, after my own two very serious battles with major depression, I have a difficult time dealing with those who are going through the disease themselves. It's a challenge to always stay in the mindset that the disease is in control of the person I'm interacting with. I imagine it is moreso with those who have never gone through it themselves. The most I can do is urge those with friends or family who are suffering from major depression to be supportive and patient as possible.
Depression is not, "the blues." It is not a feeling of sadness though it may manifest itself as such early in the process. By the time major depression sets in, emotion becomes stripped entirely. There is no joy, no sorrow, just numbness. A room full of the people you love most could spend hours telling you how wonderful you are but you won't believe them. You can spend time doing what you love, reading your favorite books, listening to your favorite music, watching your favorite movies, eating your favorite food, and none of it will do anything to give you any pleasure. In a sense you become a Vulcan, a walking machine of self-constructed logic. When you lose the ability to love or become angry then the end is close because then you are left with no emotions at all. Life becomes a series of meaningless tasks with no pleasure, no displeasure, no purpose. The future is simply a series of the same things repeated over and over again. In that state, suicide becomes attractive because the point of living is entirely lost. You're a functioning vegetable and if that is the case, then why continue with it? Just before you decide to take your own life there is a rush of emotions but they're like trying to listen to a conversation just out of earshot. What's important is simply completing the task of ending your own life, doing so in such a manner that seems reasonable. By then any empathy with those you used to love is long gone and the disease has convinced you that while the cleanup may present people with a minor inconvenience, you won't be missed.
Then it's done.
All of that has nothing to do with the person and everything to do with the disease of major depression and what it does to the person afflicted with the disease. Please remember that no matter how hard it may be to rationalize. It may save the life of someone you love. Try to be supportive, not to listen to the disease talking to you through the mouth of your loved one. Try to help them get help, reinforce how much you care about them, and never nag. There's not much you can do other than to demonstrate your support and love by literally being there. The truth is there is little you can do. Help take care of pets, maybe do some chores, or just sit quietly with the person. My single greatest consolation was my dog and he never said anything. He just loved me completely and without question. He did more than any of my family or friends because he didn't question me, didn't badger me, didn't get angry with me, didn't try to cheer me up. He was just there, quietly demonstrating his fidelity all the time. Christ I loved that dog.
Well, there it is.