After Brexit and Trump last time round my friend told me he thought there were about 30% of people in the UK and US that were, to put it mildly, susceptible to these nationalistic, tub-thumping men on the make. Well, ok he called them ‘;thick’ but what they actually are is hurt and / or cunning.
What do you do with such men and women when they become leaders? Well you should have an education system that is not classed base, treat every citizen as equal before the law no matter how much money they have, and educate everyone to their strengths so they actually enjoy learning as much as the Prom.
That will give you better, confident citizens who are strong minded and not easily swayed.