Suicide is irrational. You are born with a natural instinct to survive. I'm sure it take plenty of will power to override that, but if you seriously can't think of another way out of a situation than suicide, you either aren't thinking or aren't trying hard enough.
There is always another way, even if it's getting killed by someone else. Never, under any circumstance that I can mentally conjure up, is suicide the only way.
When you think about it, every waking moment of your life, suicide is an option. Don't agree with my opinion? Then killing yourself is an option so you don't have to deal with it. Ignoring it is a much more beneficial and safe option. Arguing it is less beneficial, seeing as you have to deal with it more if you're going to change it, but still, it's an option.