But it can turn out ugly. I read one gal got killed in Hollywood for shooting a beggar. A fight errupted when she would not pay for her cell phone photo and she got stabbed. But as I read more about it, it seemd her mouth may have been a big factor, more so than not paying 50 cents. But I don't have all the facts.
If someone is worried about street, they should ask first or do some other form of freezing time. No one is arguing that every situation is different and trouble can errupt. If and when your not comfortable, don't do it.