Trump MAY be nefarious or plain stupid. We can not be sure in every case.
What we can be sure of is his irrationality.

I am irrational. I bought a deuce coup instead of a practical passenger car because I am self centered to some degree.
We all are.
This is an important model in economics.

The irrationality of Trump is bigly hugely greatest on Earth as the greatest person to have ever lived DANGEROUS.