This is an excellent article and excellent advice for our day to day situations.
Unfortunately despite your optimism on 10% this isn’t going to work on a mass scale. On the national stage the resources simply don’t Exist to you invest this time and energy into every Trump supporter.
Other action needs to be taken, possibly drastic (legal obviously) in order to stop the Trump populism poison from spreading. Their influence is malign and has to be stopped.
In a way Trump supporters are right about one thing: they are actually under attack and for very good reasons.
What is needed is crushing victory of some sort. Trump supporters can only be rehabilitated en masse in the same way defeated Germans and Japanese were, in defeat. The victors then must be magnanimous.