I'm not going to acknowledge the legitimacy of his motives because it's what he wants. He wants to be viewed as a martyr and to have his grievances heard and discussed, but killing 20+ people over stealing some IP (and not even a life changing innovation but a fucking manga) is categorically unacceptable in any society and is a disgusting act. Therefore, I will not even acknowledge that he has rational motives; he will be considered insane and disregarded as a fool, and I will move on without paying him or his "grand gesture" any mind. This is the ultimate punishment for an angry idealist who is demanding to be heard.