In reply to marsbar:
> I agree. I don't like words like evil, it's another way of saying "the devil made him do it".
> Some people choose to do bad things and are otherwise quite sane.
And yet other people choose to do 'good' things that are not what others consider to be 'good'. Using social convention to define what's good doesn't always work either (e.g. 60 years ago what was normal would not be considered 'good' now).
It's entirely possible (and quite likely I think, given his comments) in this particular case that he believed he was doing something for the greater good. (I shouldn't need to say it, but of course I think he was gravely mistaken - he did something bad, and it wasn't for any greater good IMO. There was a man who tried to assassinate Hitler, and he was doing something bad, but some would say for the greater good.)