Anakin might be one of the better popular examples of how someone being failed from everyone around them, have their choices restricted and their will supressed, and that can lead their fall into fascist ideals.

He is born into slavery. He is rescued from slavery because he is told he is special. His mother is not special and so she is left behind and ultimately dies due to that. He lives with justified guilt and anger as a result.

The man that rescued him from slavery dies, leaving his reluctant protégé as his only real connection as a pseudo-big brother and mentor. He feels yet more loss and greif for this.

That mentor constantly places major expectations on him, telling him he is special and chosen, but also constantly criticizing his impulsivity and controlling him. He feels constrained.

He has a close association with power, but is always denied it himself even when he has contributed more than others. He feels betrayed and unappreciated.

He belongs to an order of people that tell him that all of these emotions and internal conflicts are wrong and dangerous. He feels dirty and hopeless.

He is told romantic love is off limits. He dalies in rule breaking, mainly in regard to that last rule. He loves a girl and she falls for him as well. The world doesn't implode. He starts to question the world view that was pushed on him since childhood.

A charismatic leader starts to give him attention, appreciation, and trust. He offers him power. He tells him that his feelings are not wrong, but strength. He tells him that he need not repress himself. He can seek that power, gain love, and ensure that he never loses anyone again. He questions everything for the first time and looks up to the man giving him this flattery and ideas of grandeur.

Then those in his order, specifically the one that most directly denied him the approval he sought and earned, tell him that this charasmatic man is evil, that his ideas that made him feel good about himself are wrong, and they attack this man. He is forced to make a choice between a highly moralistic, often hypocritical, and restrictive ideal, and the first taste of appreciation and power he has ever felt in his life. And on the spot, it is no wonder he chooses the latter.

It is obviously dramatized and he takes a real hard swing real fast with the immediate genocide of his entire order, including children, but... other than that, it is pretty realistic.

If Anakin had felt more accomplished and appreciated, less controlled, and free to love and live a happy peaceful life with his wife and kids, he would have been far less susceptible to the silver tongued fascist and probably wouldn't have made such a turn.

I am not sure how to fix this in the real world at any real scale, but to make sure everyone feels more appreciated, secure, and free. I'm certainly not justifying fascism or fascists' fall, btw. I'm just being realistic and seeking solutions to address it. I do think it becomes easier to fall for fascist messaging when the society, economy, and community are not healthy and supportive of all in it. But on a more micro-scale, I think all you can do is make fascism the less appealing choice for the individual. Make those at risk or on the brink feel loved and appreciated, even if you are very concerned by the beliefs they have started to take on and share. Make your boys and men feel loved and tie that feedback to simply being good people. Yes, I am saying to be less judgemental and give people a cookie for doing the bare minimum. It only costs you a metaphorical cookie and it may just buy you one less fascist.