or maybe the kind of person who want to blow up civilians in Times Square - is the kind of person who is very very stupid.
Most of these homocide or suicide bombers are pretty dimwitted. Richard Reid the would be shoe bomber - dumb as a post; the underwear bomber - dumb as a post, the Times Square would be bomber - as dumb as a post. The guy even left the keys to his getaway car in the car bomb and went back to Connecticut by commuter train!
If these guys were any smarter than they were they would be recruiting really stupid dimwits to carry out terrorist attacks rather than being thes doing them.