How does the idea that "People are already doing objectionable thing X", make "objectionable thing Y" better? I appreciate where you are coming from - It seem

How does the idea that "People are already doing objectionable thing X", make "objectionable thing Y" better? I appreciate where you are coming from - It seems like you're saying it's not that far from existing common practices. But if people find something distasteful and think it's a bad idea, how close it is to other things isn't really relevant. Maybe those should be banned/fixed too, maybe not. But if people dislike something or find it "yucky", it's fair for them to raise objections.