There is a book call the Social Construction of Reality and, exactly like you're saying, everything in our society is a social construct. Schools, legal systems, states, money, war, debt .. they only exist because we believe they do. You can choose not to exist in something like the police and law, and go murder some people, but enough people believe in those constructs that they'll lock you up, or at the least, put you in a mental institution. There are people who have trouble understanding society with mental illnesses, and many of them end up on the streets. Hallucinations, bi-polar, schizo-effective people often have trouble working within the social constructions the rest of us take for granted.

This wasn't really meant to answer your political issue, but just to provide a context of what is and isn't socially constructed.