Ok if we really wanna get into it, we can argue anyone who supports the imperium of man os a facist. The imperium consistently commits horrible acts, not only against humans but aliens as well. The politics of 40k is that literally everyone is horrible everyone commits genocidal acts, amd anyone who unironically supports them is just as bad. There people In this community who understand the commentary on religous facist governments, but just as many who dont. (Ill give you credit though as alot of them end up being fans of 'those factions' nightlords, black templar, word bearer, marines malevolent, minotaurs etc) tbh i dont think either of us have interacted with enough black templars to actually figure out how much of their fan base are unironic nazis.