You just had some bad luck. I have passed dozens of police while going 3-5 MPH over the limit and they never took a second look at me. Same thing riding with others. The main thing in driving is try to be a decent person and try not to stand out. If you encounter an unsafe asshole, stay away from them. If you are in the middle a line of cars going 10MPH over the limit, you are probably fine. If you at the front of a line of cars going 10MPH over the speed limit, you are more likely to get pulled over because you stand out as the first speeder.