#402: I don't think that you can call suicide a cowardly act in all cases unless you have experienced those situations for yourself. What about people dying of terminal illness who take their lives to spare themselves pain, and their families the pain of seeing them suffer? Suicide is most often the action of those overwhelmed by life that they cannot cope with, and abandoned at a time when they need help.
Lest we forget that there's plenty of footage showing workers in the WTC jumping out of 80th floor windows. Is this not a suicidal act? However, are they cowards? Are they not caught up in a terrible situation beyond their control or even comprehension, overwhelmed and with no real options? At the expense of souding tasteless, it was for them a choice of jumping, suffocating or burning, and one would be a lot quicker.
However, the suicide bombers are of course by no measure 'brave'. I'm not sure if they're cowardly in the sense I would use the word, but they are/were irresponsible, unnaccountable, murderous villains. Oh, and sorry to go slightly OT.