I have a child that is over 16... a very intelligent, strong-willed, and independent child.
I've been there with the attitude, rebellion and disrespect.
It's all about children becoming adults and trying to "spread their wings"
Strong wills and independence are great character traits for adults... but children have to go through so many "learning" opportunities before these traits become an asset. It really helped me a great deal to have a partner to help discuss and implement discipline.
Of course, she is her father's daughter, in that he dealt with her issues the same way she wrote about her feelings.
IMO, cursing with anger while trying to teach children behavior techniques is parent-fail. Using a gun to make a point is major parent-fail.
Knee-jerk reactions to your children's misbehavior .... parent-fail.
There is a page of follow up where he explains (or attempts) his position in using the gun. He said he had committed this act of similar disrespect earlier using the computer and he told her "next time I'll put a bullet through it." (This threat is out of line... I agree with those who said it is teaching her how to solve her problems.) He felt he had no choice but to follow through with his threat.
Parenting does not come with a "HOW TO" manual, and until you find yourself in a specific situation, it is easy to say "I'd never..." All of the specialists that write books contradict each other with their "expert opinions" so ultimately, raising your child is left to what you know. Sadly, many parents never try to seek options.
Anger management? Yes, they both need it.
Conflict resolution... absolutely, the dad is missing the point on this one as well.
The follow up also indicated that dad and daughter sad down and read all the responses, some positive and some negative. They discussed them together. The daughter had her crying fit, and the next day was over it. Let's hope so... Let's hope so.