Someone said that common sense is not that common.
Why do pedestrians dash across the road?
Why do motorists tailgate?
Why do men have unprotected commercial sex?
and dozens of other examples.
I believe all of us, myself included, ever do things like we have no common sense.
I think it is not just a matter of common sense. Sometimes we forget the risks. And at times our self-discipline is weak and other factors or emotions override our common sense.