Maybe Death is (even) better than Life. Who knows?
As for self-sacrifice and suicide, I'd say that everyone is free to do what he wants to do. Except if you're the parent of children, then you have the duty to look after them. Suicide in that case would be a shame and irresponsible.
And suicide as a flight from problems is cowardice.
But if you're independent and freely chose to die, maybe because you're curious. Why not? Most people don't like such behavior though because it confronts them with the reality of Death and the Unknown.