Choosing one death over enough I think is right...
Your in the Twin Towers they are on fire... you can burn to death or Jump from the window... I would Jump... in that situation given two options then Suicide becomes an option...
Same as your out at sea with sharks swimming around you... you can choose to be eaten alive or Drown your-self... I know what I would rather...
Your in Prison on death row you can choose to sit it out and then be executed on some one else deccision or take your own life by hanging...
So some times yep Suicide is the right answer...
But if you mean to escape life... then there are other options... live differently (like become a hermit, traveller, Tramp etc...) or turn to mind altering drugs, or frezze your self and hope to wake up in another more saine world