I had a teen in a Sunday School class I taught who didn't have a conscience. He didn't have any sense of right and wrong, or of consequences for actions. He was a major bully; two other kids in my class of seven actually changed schools to get away from him (which made Sunday mornings interesting, to say the least!) He only respected strength -- but he also needed to be loved.

Like I said, don't limit your arsenal. Not even for the "wild" ones (even if they're animals to a large extent, they're still people to some extent.) Defend yourself and the innocent fully, but don't think that means you can't also love your enemy.