[starik36]

Think of Breaking Bad. His wife literally asked him this same question. When is it enough?

It's a mentality where you can't stop.

[toephu2]

Yup, it's called greed. It's a part of human nature. That's one reason societies create laws and penalties: to discourage harmful behavior and keep that instinct in check.

[iamacyborg]

Breaking Bad is a work of fiction.