Plenty of people have done foolish things in their lives. Bad things even. Feeling compassion for someone's plight, even if said plight was self-inflicted, is not something to be looked down upon. I've seen plenty of people "bring things down on themselves" and while I don't agree with, nor condone some of these things, it doesn't negate the compassion I feel for people, in general. As one poster said.... compassion (and empathy too) is a very attractive trait in someone.
Also, I don't feel that people who become miserable enough in life, to end their lives should necessarily be labeled as "cowards."
(As a couple of other posters have mentioned)... Don't cast stones at someone whose shoes you haven't worn yet. No one can know what goes through the head of someone who chooses to end their own suffering. Personally, I feel someone who has reached that point and is miserable enough to TRULY want to end their own existence, needs as much understanding, empathy and compassion that we, as humans, can possibly give them.
Just my two cents and not aimed at anyone - just my general opinion.