There's excesses on pretty much everything, PC is not an outlier on that, but our culture is what it is at any given time. You adapt to the times or the times leave you behind. There's plenty of examples about cultural shifts, from, say, smoking, to music, to clothing, to everything. We do live in a world now where you can find anything you want, pretty much, as far as opinion and information. It's up to you to be critical about how you inform yourself, and what you build your opinions on.
I just don't buy there's muzzling going on, when the exact opposite is probably true, there's more access to a gradient of opinions right now than ever before (and I'm not saying that's always great).
And overall, I don't think these cultural changes bring the "destruction" of our society or anything close to that, tbh. There might be pro and cons, but there's ample room to debate that.