children fighting

The only two things these boys shared was a gene pool and an innate desire to irritate the hell out of each other. Son #1 and Son #2 possessed different interests, different personalities and different world views altogether.
What should you do then, particularly if your child was the one who did the hitting? Encouraging kids to say they're sorry makes sense. Forcing them does not.
Have you ever been tempted to call the cops on your own child? Would you ever actually DO it?