I agree that US society is changing. However I am not sure that it is really towards the left. To me the course seems to be much more towards some kind of postmodernist liberal society that has it's interpretation of history and it has certain elements of dystopia. Therefore as the time is passing this materializes more and more. However that isn't all that much left, liberal and left are two different things. In USA even on the left universal healthcare is often considered to be radical idea or some kind of holy grail that will probably never happen. While in some other developed countries even the far right is totally ok with the idea. Since going against it is considered to be the same nonsense as ending the law enforcement. What I deliberately say because USA actually has a movement that is working in that direction. This is why I think that the correct term here is postmodernist liberal society. Since both sides in the end think of how to be free of the rules of others, even if that means throwing the reality through the window. And that is basically the source of all pain, cultural and philosophical relativism. Since it is politically incorrect to call our BS, especially if they are covered in "norms". What then only adds to the pressure and the pot isn't the allowed to explode either.
Therefore in the end you get this messy and stressed society where most don't have a normal life and people who doubt everything think of themselves as smart. While in fact they are simply lost in the maze of cultural relativism that is kinda the foundation of postmodernist liberal society. Which has little to do with the left exactly since it lacks clear structure. But this isn't the right either. Postmodernist liberal society is somewhere around center and totally down to the libertarian side on the political compass. Because it sees any kind of real regulation as a threat. Be it very existence of law enforcement, functional healthcare, general gun control, keeping people away from the drugs, taxes, keeping infrastructure functional, having defined genders ..... etc. You can claim that kind of thinking like this is your right. However in the end you need to live with the consequences of the fact that you didn't close any chapters and that you have them under control. Which is evidently a dirty word in a postmodernist liberal society. Since it is seen as the ultimate threat to the liberal relativist mindset. Which likes to dream about conclusions but deep down it doesn't really want any of them.