What the fuck are you on about lol
There are a lot more variables in a rugby tackle that can go wrong and cause considerable injury. Better ban the sport.
I think targeting the knee in combat sports is unsporting that's the majority of the reason for me thinking it should be banned, Similar to the way deliberately targeting the knees in rugby is banned.
However knee injuries that are catastrophic to a career are still rare, in both MMA and Rugby. Should a catastrophic injury occur, that can affect a persons quality of life after sport.
This secret WC technique isn't nearly as dangerous as you're making out or thousands of MMA fighters around the world would be walking around with limps.