Hypothesis: All good comedy troupes require one comedian who is very good at acting angry.
Data Consistent With Hypothesis: Monty Python's Flying Circus featured the anger stylings of John Cleese, who essentially spun off his "very angry man" character into Basil Fawlty.
SCTV had Dave Thomas. I suspect that when they were young, Bill O'Reilly and Keith Olbermann watched Thomas as Bill Needle and had revelations about their careers of choice.
Mr. Show's Bob Odenkirk is a pro at this, so much so that a roaring "GOD-DAMMIT" is practically his catch phrase.
Saturday Night Live has featured many very angry players over the years, ranging from Jim Belushi to Will Ferrell.
Data That Is Arguably Inconsistent With Hypothesis: The Kids in the Hall may not count. The best angry Kid was Kevin McDonald, but he didn't project the kind of rabid fury that you get from Odenkirk et al. - his anger was the impotent rage of Sir Simon Milligan.
Conclusion: Most good comedy troupes require one comedian who is very good at acting angry.