The only part I agree with you on, is that propaganda has divided Americans and turned them into irreconcilable enemies.
The answer to propoganda is facts, which cannot be argued around.
What you will discover though to blunt the idea of facts have power, people have started to invent their own reality. It is how flat earthers stay flat earthers, or climate change deniers stay climate change deniers, or covid-19 deniers stay covid-19 deniers.
In the past if you took a particular point of view it could lead to ones death by disease, starvation, war or something else. Life was brutal. In our generation and world it is clear many beliefs do not change very much in ones world, so in a way it is harmless but it can bring belonging and purpose to ones life. One problem with the human condition is we are designed for a mission, a purpose, a battle and we live for challenge. You hear it in the depressed young woman who now lives for their child, or the fanatic religious zealot who fighting the infidel, or the christian standing against the hordes of liberals.
Like many cultures having an enemy outside the country helps create a blame culture and focus. But this simple emotional focus has gone, to be replaced with the democrats and for the left the capitalists or republicans or anyone who holds an authority position.
The problem with these emotionally driven idiologies is they have no boundaries. So defunding the police is absurd, but integrating the police in communities works. Equally dealing with drug culture is important to contain dysfunctional people who threaten the safety of ordinary folk and society. But boundaries appear to be the current hate idea, where as they define what is a functional life and one going down the tubes.
Too strong individualism leaves the needy far behind, and when the needy make up 20% of the population it matters. When the needy starts to reach 40% you know its going to cause instability and social action. But who is strong enough to see the reality and address it?
Trump is a messenger of a divide, not a solution.
God bless you