There are skills which are necessary - or even essential - for certain situations/careers. It doesn't necessarily mean that they are interchangeable.
Like you, I dislike Jimmy Carr, but given he is a stand-up comedian, I suppose what he does and how he does it is appropriate for that line of work. If he was a funeral director, I doubt it would be quite so apt.
Trump is supposed to be a presidential candidate, not a performing seal. As a bare minimum, I'd suggest that candidates for the role of President of the USA should be diplomatic and able to grasp intricate and delicate concepts quickly. Trump can do neither of these things.
I can dislike people for their personal conduct or attitudes but still admire their professional abilities. Several decades in paid employment tends to expose one to a lot of that sort of situation. I just don't see that there's anything to admire about what you seem to see as Trump's strengths.
I know exactly what Trump is. My personal dislike of him is neither here nor there. It's simply the truth.