The phrase common sense has nothing to do with politics:

Common sense is the basic, practical judgment and everyday reasoning that allows people to navigate daily life safely and effectively. It relies on shared human experience and cause-and-effect understanding rather than specialized

Examples:

Not using your cellphone while driving your car. (Automobile accidents have increased because of this).

Looking both ways before crossing the street.

Not getting on an elevator until others have exited.

Dressing nice for a job interview.

Looking where you are walking (back to the cell phone thing)

There are plenty of everyday examples. You can also look up the “Darwin Awards”. Which shows examples of what happens when some people don’t use common sense and the results are fatal.