Bolton's premise was, "Trump was wrong". Cohen's premise seems to be that, "I was wrong".
In his TV interviews, he has said so explicitly: he belonged to the Trump cult.
https://thehill.com/homenews/administration/515408-cohen-compares-trump-to-cult-leader“I describe Mr. Trump as a cult leader, and I was in this cult,” Cohen, referring to his book, “Disloyal,” told NBC’s Lester Holt.
“While I was in the cult, I was really refusing to acknowledge that the actions I was performing for my boss were morally wrong,” Cohen added.
I note that he still refers to his long-time boss as Mr. Trump.