PC is a seeimingly innocuous attempt to 'protect' people from themselves. The reality is that is designed to change the way people think. . .and then the way the behave. . .and eventually people are afraid to even speak, 'what they think'.
PC, when successful promotes fear and acts as a control; and yes, people do fear being sued. But the threat of PC, and what should be our real fear of PC, is of course, much more sinister than a lawsuit.
Nah....all PC can be boiled down to a desire for thought control.