When you are trying to learn a skill, it's very difficult to learn that specific skill when either you, or the other person, is going outside the bounds of training that skill.
Basically, the way I took that statement, is that
@Headhunter should have broken the kid's arm when he had him locked up and the kid wouldn't tap to acknowledge that he'd been got, just because he wanted "to fight." That can't be what you mean, but it's how I took what you wrote, Drop.
Some people want to fight, sure. They can go train at a place where people fight all the time. They do not need to be in a venue where other people are trying to learn in a safe environment.
Shoot, Judo even has differences in training terms for the difference. Randori vs. Shiai. Training practice vs. competition. In competition, sure thing. Rage on, knock yourself, or the other dude, out. Training... should be training.