Please tell me.....

Can someone please tell me why, when you do the right thing and people that are in the wrong get by with it?!?! It's like this in many situations. I'm going through some things at work and it seems the more I try to do right it back fires on me. I will continue to be positive in life and keep moving forward but it just bugs me to see the evil people win anything. I don't understand how people can treat people so horrible and still lay their head down at night. I don't see how people can lie, cheat and steal and look at theirselves in the mirror and think they are ok. I've never understood people like that. I've never understood how people can hurt others so bad and what they gain from it. You don't have to like or love everyone but that don't give you the right to treat them bad!!