Actually it also pose a threat to society (re-population). In theory at least. Usually traditions are formed as a preventive measure against certain threats. So I believe that at some point it was actually a problem for a community and thus it was passed on without much thought about removing it.

Poster mostly

So who drives a Prius here? I'm gonna judge you.

The truth is even the solar system is mainstream these days. Let's get out of the milkway galaxy or something.

Scream like fuck because my gender shouldn't change!