All kids, even really good ones, have their moments. When my child has those moments, she is removed from the situation, period. That being said, I don't need someone telling me that it needs to be done, I can manage that one all by myself, thank you very much.

I'm guessing that you also don't need to be told to wear shoes and a shirt when you go into a store, restaurant, or wherever. And yet, those signs are visible on many businesses' doors, because there are people who can't figure out the basic requirements of going about their business in a world with other people in it.

You've got it exactly right: When a child has one of "those moments," the child should be removed from the situation. And the definition of one of "those moments" will change based on whether you're in a library, a playground, or someplace in between. But too many people seem incapable of figuring out those distinctions.