Agree completely, but it only takes a few insane recurring thoughts to justify that what one is doing is virtuous. I take solace that there are few Ted Kaczynski individuals deluded enough to fall into this category. Even then, they tend to be targeted killings, not random mass murders.

> the dumb and the evil have always had a lot in common.

As proven by the existence of one of my favorite logical adages- Hanlon's razor.

to wit, "Never attribute to malice that which can be adequately explained by stupidity."