Flying has some truth in his post. I have close friends that were both paramedics.

One did a full career in the Army as an airborne paramedic, he loved it so much,he chose to do it when he retired. He didn't do it too long before he became quite jaded. He hated the people he had to treat because of the things they did to each other. While in the service, soldiers were hurt doing their job or whatnot. In the civilian world, they were shooting each other over a pair of shoes or because of some girl. When it got to the point that he was considering not helping someone because he knew the cycle would just start over, he decided it was time to quit. He hated the people that he was supposed to help.

It has to be the same for cops. At some point, you just get fed up with the whole process. Sure, its not true for all, but stereotypes are just that, generalizations that are mostly true. If the roulette wheel generally landed on black every time, I know where I would put my money....