They were successfully beaten down. More specifically, the ORGANIZATIONS were beaten down. The most successful protest movements weren’t people spontaneously showing up in the streets. They were the culmination of the efforts of community organizing. There was planning and they had people they could rely on and who relied on them. But things like unions and the Black Panthers were violently destroyed.

Now protesting is atomized like everything else. A protest that forms by posting to show up somewhere at some time on social media with signs is a collection of individuals rather than a group. If you’re just surrounded by strangers you don’t know, are you going to be able to take more radical actions?

That’s not to say none of the more serious/organized protests are happening though. There were those water protectors who tried to stop that pipeline. There were the rail worker and dockworker strikes. I don’t know how organized it was, but it was heartening to see the LA protests start out by actively protecting people being targeted by ICE. And perhaps there are more that just didn’t get any media attention. But in any case, you see how hard they try to crack down on those. But sometimes they can succeed.