Trying to argue with conservatives.
All that they’re great at is detouring, distancing, playing down, doubling-tripling down, disassociating, strawmen and more illogical fallacies. They can’t take up an honest debate unless there are rules in place that gives them any outs from being pressed when confronted with questions they can’t give truthful answers to.
Everyone has a latitude of openness to new beliefs. They can be narrow, but it’s important to be mindful. Being entirely immovable is not only impossible, but maladaptive
That said, it’s a rare thing when a single argument is able to shift a person’s opinion. Opinions form over time and change over time, nobody ever reads just one manifesto and goes “oh, I guess I’m a communist now.”
That could be a bird’s-eye view of social judgment theory, basically the idea that successive pitches to a person’s latitude of non-commitment are the mechanism by which firm stances can change over time.