It was actually his humor what made me think he's enfp. Reminded me of enfp's I've known. I think his stacking is so/sx, maybe it's the social instinct that strikes you as clinical? My guess is his tritype is 379 or 279 and I'm not sure what his core type is, but he doesn't seem polished enough to be a 3.
And I would actually think fast paced and tangential humor is an enxp thing in general. Enfp 7's and 6's are especially quick-witted, ime. I think he's been given pretty free hands with his show.. His interviews are really all about improvising and going off on tangents, and they don't have the typical talk show structure you see with letterman, leno, etc.. I think hosting that type of show would appeal to any ne-dom.
Anyway, I think this video might make a good argument for Fi over Fe.
[YOUTUBE="yGLzpt3caHw"]Craig Ferguson Speaks From The Heart[/YOUTUBE]
I'm not saying an entp wouldn't find making fun of celebrities unethical, but I think they would take a different approach with it. I can't really narrow down what I mean...

Maybe less reliance on personal experience and more emphasis on how "we" deal with celebrities and how "we" should change that, idk. I don't feel like he's trying to influence me the same way Fe-users sometimes do.. He's just sharing something he feels conflicted about and bothers him personally.