Harmful it is where the left are dug in deep. I remember asking my cousin what it was like at UCLA when he started there in the early 80's. He said his very first class, very first teacher said at the outset that he was a communist and that he hated Ronald Reagan. Nice.
Such a wonderful country we have, and all its history - good or bad. We are the envy of the world. Every family has its pouting babies, yet they are family nonetheless and are always welcome!