From a David Ignatius column in the Post Friday:
"American politics, like most things, is a story of what statisticians describe as the reversion to the mean"
The heading of the column is "Trump’s anti-Muslim rhetoric will live in infamy in American history".
I had a senior moment when I read the word "mean": instead of meaning the noun "average" I read it as meaning "unkind".
I think both meanings apply in this particular case.