I honestly don't think there is a more transparent truth than what goes around comes around! It's like you say...for the most part good things happen to good people and ****ed up things happen to ****** people. I have tons of examples and it's always been true for me. When I'm ****ing up, ****ed up **** happens to me. I work on myself and it works every time! There are plenty of examples of the opposite being true...especially in Hollywood and world of sports but not so much in real life.
A great example of my definition of Karma happened to me Sunday. I drive like an Fn maniac. I haven't gotten a non-dui ticket in over 10 years. Well I got one Sunday for going 76 mph because I was somehow in a 55 zone, limit is 65 in cali. I look at that as good Karma. I got a minor violation and a friendly reminder that I should drive like such an a-hole. I admit I do.
Since the ticket I've been staying under 70. I actually feel different. Karma is a real. My driving was getting to be something I wasn't in control of, I drove crazy because I got used to it and I could. It was just what I did. The last 3 days I have been fine driving normal and just staying behind the car doing the speed limit in front of me. I honestly feel different and I couldn't do that 3 days ago. Karma is real.
I think one thing most humans aren't in tune with is that we are very insignificant as individuals. Small things like the story I just told are the types of things that we should lessons from, but human nature is to think every life is very meaningful. That is actually one of the main concepts of Karma.