There are plenty of people who don't care about their survival. Suicides. Suicide bombers. Suicide hijackers. People who kill their exes and then off themselves.
Tell me why I ought not be like that.
If you are like that, you won't survive to procreate and your tendencies will be bred out of the population. If you want to kill yourself, go right ahead; the more survival-oriented will get along perfectly all right without you.