There’s crazy and there’s crazy. These guys are crazy in the ordinary sense of the word. They’re unhinged and some of them are bent on violence. If it hasn’t come to actual violence yet, that’s just because the law has been one step ahead of them.

I doubt that they’re legally insane, in the sense that they think their bombs are actually watermelons or what have you. They know that killing people is regarded as wrong, they know that it’s illegal, and they know what their weapons would do if used: kill people. That makes them criminally responsible before the law for everything they do.