Bones and Holly Holm are the best at that. it could fuck your career and your ability to walk, but these fighters literally get their body beat to shit for a living head to toe. it's not much worse, physically, then getting elbows to the head imo.
and leg locks are totally legal and just as dangerous.
Ask any fighter if they would prefer getting elbowed in the head or potentially break their leg from a kick like that. You hear the same stuff from NFL players about how they would rather risk getting a concussion versus getting their leg blown out (high vs low tackle, etc).
We all know fighters are warriors who put their bodies and lives on the line but that doesn't mean there shouldn't be some protection, and there is already, plenty of rules in the sport to protect the fighters. We want fighters to have lengthy careers when possible, not cut short due to some cheap shit.
I just don't see any kind of logical defense for this. I mean think about it, what of he broke Diaz' leg here? He's the better fighter because he pulled a cheap move? Nah, we saw the end result so it obviously would have been a tragic if that's how it ended. The sport will be fine without moves like this. And I understand what you're saying in the other post, how some things are legal and others not when it's a super fine line and perhaps doesn't always make a lot of sense, however I think this is a particularly clear cut example of something that shouldn't be allowed.