Because we're wankers.
Besides, and talking from experience, girls prefer bastards. The nice guy always comes last. And I know this is true because I
was a nice guy (aka sucker) for so long. Being a bastard was so much more fun and dramatically increased my success with the ladies... not that I really cared at that stage. That's the whole point!
Of course, all that changed when I met my match. I married her...
Mr Mephisto