That's because Trump is not a polished politician. We can't wait until he learns how to be one. That's why you don't start at the top. You work your way up. Here is how Carson helped Trump explain his latest point on PTSD.

“But basically what he’s saying is that people are exposed — a large number of people are exposed to something, but only some of them are affected. It’s very much like when you’re in an environment where there’s a virus going around,” he said. “Some people have strong immunity, some people have less strong immunity, and some people are affected by it and some people are not.”
“The ones who are affected by it are not inferior individuals by any stretch of the imagination,” he continued. “It’s just that their system did not withstand it. That’s what he’s saying. He just didn’t explain it correctly.”


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I believe that is also what Trump meant. But we don't have the time to have someone translate for Trump every time he speaks.