Political correctness IS curtailing free speech, and that's just fine!

There is much talk about political correctness on college campus. This is including, but not limited to, discussion about Halloween costumes, trigger warnings, safe spaces, and issues involving feminism and race relations. I am not going to write here about my opinions regarding political correctness, or trigger warnings, or any of those issues. Instead I am going to focus on a very weird dynamic of this dialog: The fight over whether or not being politically correct is a restriction on free speech.