If there were a late-night comedy show completely run by comedy writers, without any interference from a host, producer, or network, that show would probably be called The Darkest and Most Impossibly Horrible Things You Can Imagine, Presented as Comedy. Every sketch would end with a gunshot or an infant’s stroller engulfed in flames, and the show would be canceled halfway through its opening titles. That’s because most comedy writers are so inured by humor that only the most shockingly toxic ideas can achieve the proper velocity to penetrate their indifference.
It's why using mics (or comics in the back of the room) as an arbiter of whether something is funny can be dangerous. What's funny to us ain't always the way the rest of the world sees it.