Starkey does not 'know' his subject, but merely a tiny sliver of it, which he feels is important, but is utterly irrelevant out of the context he refuses to even acknowledge exists, so obsessed is he with his propagandising.
I don't agree with Winston on a lot of things, but he does know his subject, and is good at imparting understanding, which is the basis of teaching.
Rolf Harris I have respect for, not because he is a world expert in anything, but because he is good at finding joy in everything he does, and sharing that.