Why does everything have to be so difficult?

Karma. I dislike that word with a passion. I don't know if I believe in it but if I did, I have the worst Karma ever. I generally think that I try to be a good person, but there are bad people in the world that try to ruin the lives of good people. Sometimes I feel like why cant something end and just go away, like a particular situation that likes to bite you in the ass. Just when things start to look up and go right they go very very wrong. There is a person from my families past that is truly out to ruin our lives. And I mean literally. He is mentally ill and doesn't take medication and is trying to make my families life a living hell. For most part it generally doesn't involve me, and shouldn't involve me, but he tries to make it involve me. It stresses the hell out of me and I just can't deal with his shit anymore. It like go away please and just leave me the fuck alone. It just makes my life so complicated and I don't have the time or energy to deal with it. Why do bad things never seem to happen to him? I mean I don't wish anything bad on anyone but seriously he done so much wrong in life I don't see how its possible that he still has suck good karma. If you wanna know more I'd be happy to share, just let me know. Just a bad and stressful day but I hope everyone who reads this had wonderful days today. peace.