I think there's a pretty solid case for that being a non-optimal solution, even if you've bought all their other premises. (There's not enough of them for a single or even mass suicides to inspire other people to do so, and then they'd just lose the longterm memetic war)
I'm currently unconvinced either way on this matter. However, enough arguments have been raised that I think this is worth the time of every reader to think a good deal about.
http://nothingismere.com/2014/11/12/inhuman-altruism-inferential-gap-or-motivational-gap/