I agree that "triangulation" is pointless (big surprise that tailism is bad), but in a way I thought it was sort of hopeful because the mother agreed on many progressive policies and sentiments, and that was with very little argument over the course of less than two hours. I think it began to show the ways that having earnest discussion where you hear people out not to legitimize their views but just to understand them so that you can engage with them in a way that they can understand can get you some degree of progress, at least if the other person is still lucid.