There is a creepy factor to it.
It does seem “mandatory”, like someone took them aside and handed them a script. Or, as you indicate, perhaps they feel feel like schmucks, wondering why they made a horrible choice — and then go into denial and feel compelled to tell everyone that it wasn’t a horrible choice: it’s the best choice they’ve ever made.
the best bet is classic confirmation bias - but in the case of public figures, we live in an environment where saying the wrong thing is a career-wrecker. he is a smart businessman if nothing else.
he took a shot he may or may not have the background to realize simply had almost no testing done beforehand. human nature suggests not particularly wanting to find or agree with reasons why that might not have been a good idea. all of us struggle with some form of this in typically a laundry list of parts of our lives.
what is unusual about this one is obvious.