I would have to agree with most of what Nimzo-Larsen Attack said. But I'd like to add that fighting and self defense/killing/disabling in real life situations are quite different. In fighting competitions, the rules are there for a reason obviously, and the techniques they train in would definitely not be AS effective as an art/practice that focused completely on killing or disabling threats quickly and effectively.
For most self-defense arts like Krav Maga and Systema, there are no real, absolute rules, especially those concerning your enemy's safety.
Training for a fight competition would be starkly different from training for a fight to the death.
I have to agree.
I have seen (and experienced) situations for a long time.
For "in-house", rules have to secure safety
For reality, safety has to be of individual protection