Why am I concerned? Its creepy. If they want a picture of a character, get in line, whether you have a kid or not. I liken it to cutting in line at an attraction. You want a picture, then its not pointless, get in line. You want a picture of just Mickey, get it at the parade. In the open, yes, I have no argument, I am talking about character interactions, where there is a line, and my kids are interacting with the character.
It's not sinister. People take these photos, whether ill intended or not, and post them on social media, and it is something I am against.
Again, we are discussing photography etiquette , therefore a picture of just Mickey and my girls, should not be on other peoples phones, as a matter of respect.