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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.
Maybe i will not compare boxing with slapping. Slapping is more insulting than boxing or any other game. I don't know the rules of slapping game but it seems like it will be an insult for the opponent to get a slap. That's why we don't see this slapping tournament popular anywhere in the world.