When did this become the arguing the philosophic views that surround our life club? Well, considering how much this debate is flooding the hell, I figure I would throw in my two cents, completely ignoring previous posts and posts that will come after this one. So after this, I will not participate again.
What sirtom did/attempted was inherently selfish, assuming suicide would be the next step. Revenge, as many have put it, does nothing but start a fresh cycle of violence, to quote karma. Him getting revenge on those who pissed him off without trying to deal with it without resorting to violence. He might as well have told them to stop, but if you're going to do it in a sheepish manner, of course they'll ignore you. Learning to assert yourself in such a way as to garner respect yet not enough to strike fear is a key part of life. Because sirtom is only 16, I don't expect him to reach that level yet. However, his immaturity does not excuse his actions because he knew full well that burning down his school would not only hurt or kill others, but end up with his demise (jail, suicide, what have you.)
Sirtom's actions are not justifiable by any means. Sure, I've hurt things, but as a hunter. As a hunter who uses a bow, I abide by the ancient code of hunting established by the American Indians. This code, in short, teaches hunters to not only respect the hunt, but to respect the prey as a formidable foe and to worship the prey as thanksgiving. Now, I don't necessarily worship the deer I might kill, but I sure do appreciate it. I hunt for sport, but at least I have the decency to eat the animal for dinner and to use the bones for other unimportant things. Yes, I kill things, but in the way that nature had intended (well maybe not with a compound bow, but the general idea is there).
TLDR; Sirtom is selfish for thinking ending the lives of others will solve anything. Why do you think most gunmen in school shootings kill themselves afterward?