1. because humans are selfish and often do things that benefit them. 2. they get screwed over because everyone is jelly that they are good people and the rotten people try to drag the good people down so that they can feel better about themselves....
When you do the right thing you know your going to get screwed. So that's why it's so hard.
The wrong thing is naturally easier otherwise everyone would be good without effort<br />
And it's pretty much the same thing for the second question too