In PE petechiae goes with the territory.
There is great controversy on this subject however many men get this condition and I have never heard of any kind of permanent damage. Some men are more prone to it than others.
In reality if we take everything literally ALL forms of PE are dangerous. We cannot hang weights because it can have a negative impact on circulation. We cannot vacuum pump because it causes petechiae, we cannot use stretchers for the same reason that we cannot use weights.
OK, I guess we can all go to PE surgeons who have maimed more penises than everything else combined.
In any form of PE there is risk and this risk needs to be minimized at all costs. Never practice PE in an intoxicated condition, never practice PE when you cannot give it 100% attention, and above all research research research what you are doing BEFORE you do it.
People have been injured with jelq, people have been injured with kagels, people have been injured with pumps and all the rest.
But:
People are injured by taking aspirin, people are injured by combining alcohol and painkillers, people are injured by automobile accidents, skateboards, bathroom showers and these accidents all outnumber PE accidents by a wide margin.
I do not disagree with Industrial in that this can be harmful if not done well, but, we need to be very well informed with what we do and we need to know what we are doing and take it slow and easy. If you have a negative side effect from your routine take the time to stop and do a re-assessment of what it was you were doing that created the problem and then alter the equation.
We are never going to eliminate this activity and the only thing that will ever work is education and caution.