You can't deprogram cultists with logic, since their views aren't based on logic. If you confront them with facts, they just cling more tightly to their delusions.
The best course for dealing with Trump cultists now is to just pat them on the head and ignore them. After the humiliating failure of their fascist coup, they've been neutered. Without Trump's daily propaganda dumps, some of them will drift back to reality on their own. Some won't. There's just no way to force them back into reality. They have to find their own way.