Metaphysically, There Are Only Always Individuals

A mob seems like something that a person might instigate somewhere, but then swiftly takes on emergent dynamics. How do you deal with those kinds of examples? So I think it's a great question and it's actually at the core of my PhD thesis. My initial opening case is, if there was ever a case of a social group, it seems to be a mob. But let's put that appearance aside for a moment. In virtue of what principle unifies these individuals as members?"