The bell curve IQ statistics are very hard for some people to accept. But they are what they are.
Having been to a couple of lectures by the authors of The Bell Curve, I guarantee you, the protestors had not read The Bell Curve. In fact, I doubt they even got through the first few pages.
The book is based on data. Without a couple of statistics courses it’s doubtful they would understand B weights, beta weights or standard error.
They prove the point.