How Can People Justify Supporting Trump?

I do not understand how people can continue to support Donald Trump as a Presidential candidate. He says that he wants to use nuclear weapons.  He does not seem to know what would happen if nuclear weapons were used. He grasp of reality is tenuous at best. He loses his temper too easily. He says that he does not need advice from anyone. Every president has had advisers. He is racist, chauvinistic, homophobic, etc. He cannot stand for anyone to criticize him. He acts like a spoiled child. He has made money by exploiting other people and using bankruptcy laws. I could not watch his reality show. I hope that those who support him will wake up to reality and dump him.