Political Correctness is a mind control tool of extremists, mainly but not limited to, the Left. It is an example of 2% of the population controlling the other 98% by a simple trick which the 98% are gullible enough to accept. It is a house built on sand and will come tumbling down when someone (Trump) pushes it.
PC came from The Frankfurt School ideology. They conceived of concensus building and sensitivity training. They and their minions at Columbia U are a big part of America’s downfall, as they hoped for. Obama is a crowning achievement.