Don't give up your life because of one person

10$ is 10$

Ah, yes. But if you let someone think it's okay to steal $10 then they'll think, hey! What's the harm in stealing $20?
Then $50.
Then $150.
People are greedy, you've got to have some control.

Someone massacres your entire family in 10 seconds? Don't waste your time on him, just move on.