Maybe… My understanding (which is admittedly based on not much hard evidence) is that right wingism is more of a symptom than a cause, and that there are basically two or three drivers:

• insecurity, particularly financial (e.g. shows up as “they’re taking our jobs”, or "fucking dole bludgers). I think greed is sometimes an excessive response to this.
• trauma (e.g. I was treated terribly, and so I’m gonna treat the world terribly in turn).
• power-hunger. (which is probably often a reaction to the other two, a need to control your world).

The insane far-right that are in power in the US, and the people surrounding them are most of the third category… I don’t think much of the base is in that category. But that group knows the triggers for people in the first two categories, and abuses the fuck out of them…

So yeah… I guess you’re right in that “convincing them of the truth” of any single issue isn’t going to solve anything. But I think aiming to solve those underlying insecurity and trauma issues might… Not that I have any quick-fix solutions…