One more point here, made clearly by Marx, is that understanding how systems shape humans both as individuals and as a society is not de-humanising, it’s possibly the most humanising something can be. To be human is to be shaped entirely by your environment and your reactions to it simultaneously, and mass psychology is how we come to have anything remotely psychological to be. It’s finding how to live as both a human individual and a human who partakes in, creates, or grows away from mass psychologies. This misunderstanding is exactly Nietzsche hate for the masses. He attempted to understand HIMSELF as not human in this way and create a philosophy around it, while he himself was calling back to individual, anti-change philosophies from the Greeks who did the same (Plato as opposed to Aristotle)