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The vast majority of people competing at ADCC, EBI, and Metamoris are black belts, with the rest browns and VERY few purples. And those purples are top of the line that would be brown at most other schools. You start letting run of the mill, casual purple belts heel hook and you will see LOTS of blown knees.
People can laugh off or tap at a GQ or NAGA, but when you are at an IBJJF event people are going to push their limits and that is where injuries occur.
you will see lots of blown knees because people don't know shit about leglocks, they don't know the mechanics or the proper defenses. so what happens is they don't defend it, but they don't tap to it either. that's where the trouble starts.
but justifying the ban with this argument is dense. heel hooks need to be banned because people don't know how to use them responsibly... because they're banned. i've seen a local ADCC rules tournament, where you had people from blue belt to black belt - leglocks were thrown around in every match and not one of them resulted in injuries.
now you obviously don't want people completely new to the sport doing these moves, but anyone at purple belt level or above knows what they're doing. they've pretty much seen it all already, there's no need to assume they're mindless idiots who will just tear each other's knees out.
as for people pushing to their limits in IBJJF finals, i fail to see how it's any different when they're caught in any other submission. you don't think they're pushing to their limits with armbars, kimuras, kneebars?