First, you fight the way you train
I'm glad this isn't true, in fact.
99% of my training for years has been hard style kick and punch, 1% has been arm bars etc. I have also been attacked by violent teenage clients dozens of times.
If I'd of hit or kicked them, I'd have been charged with a crime let alone fired on the spot.
I don't fight like I train, and I have to be clear when I train others that I am not turning them into a destructive automaton, just giving them tools to allow them choice.
Trianing, sparring and fighting are all different and not just parts of the same whole, and they are not equal.
"Fear, not compassion, restrains the wicked."