At their core, many are just bullies and it nicely appeals to the emotionally stunted desires of their base.
I recently watched a Nazi documentary on Netflix, and the parallels beyond concerning. If Trump is elected, you should expect Brown Shirt like violence.
For those who think my statement is alarmist, it takes time for fascist propaganda to build inertia, and we're somewhere in the middle of the progression. If you're paying attention, you can see and hear the rhetoric getting more violent. They are following a similar playbook to the Nazis by stimulating the rural communities with more and more nationalist rhetoric.