If someone is dumb enough is try that, they should go for it. If a coach is dumb enough to allow that, go for it. If a parent will be ignorant enough to allow their child to do that, go for it. Its all about risk. If youre willing to be risky, you have to pay the price.
Should we ban skydiving because its dangerous? No, people know what theyre getting themselves into. Same thing as smoking, it says on the pack how dangerous it is, but people still do it and suffer the consequences of the risk involved.
Everyone knows the dangers of trying a double full or back on a hard gym floor, if you wanna do it, you gotta be prepared to pay the price if something goes wrong.