A case could be made that it's guns, fluoride, religion, cilantro, abortion, studded tires, bicycle riders, country music, parking meters, SUVs or Leonard Pitts.
But if you asked me, the most polarizing subject in our society is women choosing to keep their last names after getting married.
There are people who just become unhinged about the idea of women making that choice.
The real experts on this are those name-keeping women, of course. So if you don't believe me, ask one of them.