I used to work with a very intelligent woman who had recently graduated from college. Somehow the subject of the American Revolution came up and it became obvious she had no clue as to which country we rebelled against, or when. She was a bit insulted by my reaction as it never occurred to me that anyone in this country wouldn’t know that, and I was shocked by her ignorance. She explained that she simply is not interested in American history. I explained I’m not interested in astronomy but I know what the moon is. Anyway, she’s a huge leftist from the SF Bay area. I suspect most of those completely ignorant about our history are leftist radicals, if they are involved in politics at all.
You are right, they know nothing of the history of all the infrastructure that they want to destroy.
In short order we learned that she did not know the meaning of the words “gauge”, “rebar” or “Rottweiler”. She'd never heard of any of those things — but she sure was strident about being a vegetarian!