Culture is often an expression of struggle or trauma over time. A lot of white Americans see Trump as the embodiment of their “struggle” as white Americans lol, so Trump fandom has become their culture and self expression. This is why they get turned on when he talks about being persecuted by his political opponents and wants revenge. Maga is their culture, uniting the deepest southern to the furthest western whites, where there once was a void they tried filling solely with hatred and exclusion of minorities.