It is really not, Trump is a symptom of people despising the status quo and feeling helpless in an unfair system.
Trump has tapped into a populist message. Of course he will only do what is in his self interest and does not give a shit about his supporters. But to the average person who just consumes Fox News and social media he looks like he can change the world for them… Or at least hurt those who are hurting them.
The right wing media has steadily eroded social norms and echo’s the extreme right when they call for violence against the left.
It’s not to far of a leap to say that an ignorant victimized populace which has been desensitized to violence and wants to punish those who they believe have hurt them would cheer just as hard as the left when a CEO of a deeply unpopular company is killed.
The right has been feeding the population violence and extremism for years. All the while targeting their anger toward other groups while taking advantage of the population. I don’t think they understand the monster they have created.
It almost seems like you are responding to the wrong message—I agree with everything here except your setting off with “it’s really not” in response to illegal migrants?