That's because reality mixes them. If it was just a case of professional sports ruining a few hundred lives for entertainment like in the decadent years of the Roman Empire, well that would be bad but on the basis of sheer numbers it would be small potatoes compared to things like a million deaths a year from road accidents or the major powers treating Syria and Ukraine like puppies fighting over chew toys, so I probably wouldn't bother to comment. But it's creeping into the general culture. For example: how many Americans have played football at least for a while in school? Now consider that everyone who plays American football suffers irreversible brain damage, and the total harm becomes substantial even on the scale of bad things happening in the world at large.