Originally posted by Wheatfield snip
For the Americans on the forum, one really quick way to get laws surrounding this sort of thing changed is to be a jerk about your "First Amendment" rights. You either respect people or you don't, and taking their picture when they have made it plain they would prefer you don't is about as disrespectful as it gets.
In a worst case, the victim of your rudeness might take the law into his own hands, and depending on how threatened they feel by you, the consequences for you can range from snip
Wheatfield, I just do not believe that you understand just how difficult it is to change the US Constitution. I previously posted this link for something to illustrate the state of affairs surrounding "Street Photography" within the US.
https://www.thephoblographer.com/2018/09/04/what-you-need-to-know-about-street-photography/ If a person "takes the law into their own hands" --- first it is not against the law to take photographs in public, this is not taking the law into their own hands, they are breaking the law.-- then they are guilty of assault -- plain and simple.
Now it is important to not be a jerk, so jamming a camera in someone's face is not, in general, a really good way to get that shot. Being sneaky is almost, but in my opinion, worse than jamming a camera in someone's face. It is important to be civil, but no, you do not "have" to delete the image to satisfy someone's request but then you don't have to purposefully be a jerk about it.
In the US, if you are in a public space, there is no expectation of privacy. This concept has been litigated to death and it ain't gonna change any time soon. And as I walk through the grocery store, I see that paparazzi are a popular in Europe and the US as ever and CCTV is everywhere - literally everywhere - in Europe.