I heavily disagree with the 'it should be banned' statement. For many multiple reasons but that's not the purpose of this thread, as I already know what I think on the matter, I want to know what you think.
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No. They know what repeated blows to the head to the point that they are knocked out will do to them, at least they know it can't be anything good. They know what they're getting into. Don't stop them from doing what they want to do.