As a Conservative or a Liberal, you would do the same. People change their minds. They become more enlightened, or less so, and choose their sides. We take them at their word. Even I changed my mind, having once been a very avowed liberal.
Every-other generation has a populist who stands up and says he’s tired of the status quo – a status quo promulgated by parties that our Founding Fathers railed against as factions and destructive to the Country they founded.