Typhon, I think you hit the nail on the head. I must admit, my hypotheses weren't the best this time around, but hey, that's why we have forums like this.
Ultimately, I agree that this man's actions are the result of things that happened to him as an individual. As far as various lobby groups go, the most they would have contributed is a general attitude of indifference towards this man's situation, but not directly. Outside of that, I stand corrected on the reverse-hate concept. Sometimes I make bad assumptions when information is limited.
Other than that, I must admit one thing. The reason I "understand" this guy. I was once in shoes like the ones this man was in. I was 16, very heavily depressed becuase I came to grips with the fact that my year-older girlfriend was using me as a cuddle bitch while also dating other guys... and girls. A 14-year old friend of hers infomred me that she was molested by her, and the fact that my girlfriend often demanded me to bring her porn didn't help. Also, infighting at my church, and the removal of a youth pastor I looked up to, I felt like there was no where to go and no one to talk to. I'll be honest, I wanted to die... but not before I killed a bunch of people first.
The difference between me, and this unfortunate fellow, is that we made different choices. I decided to put my hope in God, leave that church, and ditch the girlfriend. It wasn't till college that I could find another Christian man to model myself after (and even though he doesn't know about the MRM, he often stands up for 'men' in conversation, one of the very few Christians I know who have picked up on what's going on!), and after many dates... still haven't found a worthwhile girlfriend. But, the point in case is that I was once tempted to do what the man in question did, so I have an understanding of what his reasoning might've been, but I have chosen otherwise, gotten past the storm, and I also know that he could have, and should have, chosen differently.
Besides this, I wonder how many more men are also in the same shoes. I hope to reach such men before they degenarate and become violent. This should have been my main point fromt he beginning, though it wasn't. Therefore, I stand corrected.