That's fair -- "cooked" does imply an increase in entropy that can't be reversed. I think it sadly is irreversible in some people, but many others can be brought back (you're already starting to see a backlash to Trump).

Being exposed to the arguments over and over, repeatedly, probably matters more than their quality. That's what I was going for with "cooked", since "persuaded" isn't quite the right word for it.