The number one source of discord among couples is money. However, politics is becoming an ever-increasing source of arguments and even break-ups according to a recent study. The 2016 presidential election was one of the most divisive in modern history, and the strong feelings that many people had last fall don't seem to have greatly dissipated.
Can you be arrested on no other charge than resisting arrest? While it's rare, it's possible. Usually resisting arrest or obstruction of justice charges are added to charges related to an illegal activity for which a person is being arrested in the first place.