Not at fallacy at all. One of the reasons Reagan was successful is he tapped into the moral majority movement that faldwell created in 79. He put a majority of the Christian rights social issues front and center. Goldwater had attempted to tap into religious movements in 64 but was unsuccessful. So to suggest that this is new and not a two way street is pure ignorance on your part. You probably weren't around back then so that might explain it.
You give me an example of a time when only one party was pushing social and wedge issue while the other one wasn't. Good luck with that one. It takes two to tango
You are blind if you don't see that one side is actually infecting intuitions with power while the other is not. How many corporations do you see bending over backward to appeal to right leaning extremists vs openly supporting a violent, disintegrationist left leaning movement like BLM? How many institutions like public schools and the CDC are soft peddling transgenderism while saying anyone that questions the limited efficacy of cloth masks is "denying science?" How many boycotts from celebrities and companies do you see against right leaning legislation in states such as the bathroom bill in NC? One side is literally proclaiming that what they feel is inscrutable scientific fact and has institutions such as Universities, public schools, the CDC, physician groups like the AMA, and major entertainment media near universally backing this narrative.