You're being downvoted, but assuming you're talking about small non-weaponized drones, it's not necessarily a horrible idea. If you could do it without the people noticing, then you could learn a lot and not harm them. Of course, you'd heavily violate their privacy, but it's better than exposing them to diseases. I'd say I'm still against it, but given the kinds of viewpoints on privacy that are mainstream these days, it's at least worth contemplating...

I guess you are one of the main reasons why they really don't appreciate our appearances there.