I was just about to write something similar to you. I think that these causes could be proven, though it would be difficult because they are claims about trends rather than more concrete, isolated incidents. I think that's one of the problems of the left currently: they tend to focus a lot on "the big picture." That's important. The big picture affects all our lives because it consists of things like culture and society. The left's mistake is that they have somehow forgotten entirely that the small picture still exists and is also incredibly important. You can't just ignore one or the other. If you do, it will have bad consequences.