In your previous post to me you were applying a princible that said any subject was off limits if it was divisive to any parent willing to complain. Thus, under your system of justice, a bus driver better keep his trap shut about everything.
You are being deliberately obtuse and you know it. There are many subjects one can discuss with children without getting into trouble with their parents. I've managed to do it for years!
The bus driver in question "just happened to" stumble into a position that fully half of the people in the United States disagrees with. It's not quite the same thing as a random, known crackpot disagreeing that grass is green. But you knew that.