What you describe is deeply sad and frustrating, and I think you’re exceptionally brave and clearheaded for facing the hurt and grief (losing your dad while he is still right in front of you, but no longer ‘there’ in any way that could fulfill your need for a father). So many, like the family in the video, just make it abstract and suppress the hurt.
The bolsominions are similar in so many ways to the trump fanatics that really I think we can reject the idea of some super charismatic leader making people go nuts, and contemplate this phenomenon as being the right and far right on a rampage around the globe.
The fact that your father has been trained to resist brainwashing and psychological torture are a whole extra layer of difficulty. All I can say is goddamn it, and I’m sorry.