Poor people can and have done astonishingly horrible things as well. If you aren't trafficking children to rape yet then I highly doubt you ever will.
The thing is people who are born in to money are shaped to think they can do anything. Just look at Andrew, the ex Prince.
He is rich and perverted but thought he could do anything and get away with it.
He wasn't beaten or abused, etc, which turned him into a monster. No, he chose to go that route.
But not all rich people choose to be evil, just like not all poor people choose to be angelic.