But that side is the party of "evolving" positions. They can be against something publicly for their entire career, and then take the totally opposite position and be hailed as a hero for doing so
Oh, fercryingoutloud, obviously politicians of both parties change positions on all kinds of things over time. As do regular people. Changing your views because the evidence changed or you re-checked your analysis is good. Changing because the political winds shifted and your prior position wasn't sincere or based on any deep consideration is not good. None of this is special to any political party - in America or anywhere else, now or at any other time in history.