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Right on, these people are worrying over something that they see everytime they watch a bloodsport like boxing or muay thai, if you hate the game, just say it and don't say that it's going to cause damage to players, they consented to this and they know what they're in. We are in an era where workers and artists and almost everyone has some temporary rights.
That's because these people can't say it directly that they hate the game, they make reason so they sound intellectual when in reality they're hypocrite for hating slapping matches when at the same time they're enjoying boxing and other contact sports that tends to get much bloodier than slapping.
I agree with what you said, because in my opinion the tournament is still within normal limits, so it can be said that the game will not be too dangerous for the participants, after all, every tournament will certainly have special rules that will not endanger the lives of those involved participating in the tournament, compared to the boxing, mma and ufc obviously the game is still safer in my opinion.
Differ in some factors but there would always be that risk.