Liberalism is the cause, and it started about 20 years ago.....very gradually so it would not cause a ruckus in the American culture. Now we are entangled, entrenched in PC.
The good news is we have Donald Trump, our President, who doesn't give a sh it about PC. Consequently, more citizens are not as afraid as before, but it will take years to rid ourselves of this cancer. Will probably never go away.