You're assuming most Trump supporters have done something called thinking in the past?
I wouldn't dismiss them as easily as that. Even flat earthers have highly qualified people - so I hear. Look here at the support he receives on this thread. There are patterns you will recognize if you go through who supports trump
1. High probability of being specific race
2. High probability of belonging to a specific religion
3. High probability of them equating malema with all blacks.
4. Perhaps not so high probability - similar to confederate flag supporters over there, old SA flag supporters here
All this is exactly similar to support trump gets that side on the so called bible belt. It is amazing to see how people unite across continents.