Our society has gotten to the point where everything has to be controlled. If not by the Government then by other civilian organizations. But the whole thing is control. Having everyone labeled is a form of control, sorting, and organizing.
We will never know.
Easier for some to judge that way.
Because it's impossible to treat people you don't know as individuals. It makes them harder to exploit and ostracize.
To organize us better into herds.
To make people feel better bout themselves
so we can remove them :)