You do realize that just because other people act like jerks, it does not give you license to do the same, right? I don’t know why you believe what you are doing is going to have a positive outcome for anyone, including yourself, but I think you have some serious growing up to do.
I’m sorry you had to go through what you did, I really am. It doesn’t sound like a positive experience and I have my own chronic health issues that have been a battle and I can understand being angry.
I just don’t believe it is yours or anyone’s place to take matters into their own hands, nor do I think their actions justify yours. In this situation, you all suck.