I'd like to take a second and say Excellent question!!!
(who hacked your account?)
The answer is POWER. When the left was all for freedom of speech and free inquiry and open debate, they had no, or less, power. That rattled, as intended, the establishment which was very conservative socially. Keep in mind that Sal Alinskey was going, mainly, after big cities and the D machines that ran them because that's where the oppression was. Over time, that changed and there was something resembling equality in the 80's and 90's. Over more time that has changed and the left has become and remained THE establishment in much of the US and especially colleges and universities. Now, still, always, freedom of speech and free inquiry and open debate is a threat to the establishment, an establishment that is leftist.
He who has no power agitates to get it. He who has power works to keep it. It's how biology works thus it's how WE work.
Nepotism begins at home
Never attribute to malice that which is adequately explained by stupidity.
- Robert J. Hanlon.
"If you pick up a starving dog and make him prosperous, he will not bite you. This is the principal difference between a dog and a man." - Mark Twain