The self-destruct button

I mean if life's so hard already, why do we bring so much trouble on ourselves. What's up with the need to hit the self-destruct button? Maybe we like the pain. Maybe we're wired that way. Because without it, I don't know, maybe we just wouldn't feel real.

What's that saying?
'Why do I keep hitting myself with a hammer?
Because it feels so good when I stop.'