If something is "normal," we tend to accept it. If something is not "normal," we tend to be wary of it.
But what we call, "normal," may in fact only be, "usual." That is, we have accepted things as normal because we see them all the time. So often, our standards of what is normal are confused.
I would like to accept cycling to work as "normal," and driving a car as the "abnormal," wasteful, health-impairing, environment
destroying activity that it is. Freeways jammed with thousands of cars everyday is not my idea of an acceptable standard no matter how common it may be.