The phenomenon Trump is caused by the "innate" propensity of mammals to "play-fight" for dominance when growing up.
"Agonistic behavior [in Wiki} involves tests of strength or threat display that make animals look large and more physically fit, A DISPLAY THAT ... ALLOW IT TO GAIN THE RESOURCE [ELECTION IN HIS CASE] BEFORE AN ACTUAL BATTLE TAKES PLACE."
When the time comes to "elect" a leader in nature, animals don't risk injuring themselves in fights since they already had learned who was the dominant personality at a young age, when it was not dangerous to fight among themself.
The Apprentice, which presented Trump as a dominant personality, has played this role for 30%-40% of the US population. I'd bet $1,000,000.00 on that one!