JWs are just Jihadist by proxy; they expect god to do the killing for them.
But it really is that simple; they look forward to a time where un-believers will be anihilated, just like Wahhabi (and other extreme Muslims) and many fundy Christians (ya, know, when they all go float up to the sky and we all die).
Religion is pretty dumb, but if it is your thing, go for it prvided you are truely exercising your own freewill.
However, religions that preach anihilation of non-believers, whether by their own or god's hand are evil.
Problem is 'normal' Muslims will rarely condemn the Jihaddi as they should, 'normal' Christians rarely condemn the fundy nut-jobs as they should, and obviusly JWs don't admit when they are wrong, LOL. Kinda off topic though, just thinking.
As for this guy; there are mentally ill people everywhere. Maybe his religious background was a co-factor.