Because conservatives can't be funny anymore.
This wasn't always true. SNL in the early 1990s leaned pretty heavily right, and people consider it the golden age. Watch some reruns if you can find them, you'll be shocked. But back then, conservatism meant "we should fight this one war with the clear objective of liberating Kuwait" and "taxes should be lower".
After 9/11, the right's comedy bankruptcy followed the same course as their ideological bankruptcy. Every hack had this routine: "I had over 9000 minutes of material about Islam but I can't tell them because they'll MURDER me! But here are the same two jokes about burqas and 72 virgins anyway."
Now, conservatives have had so many aspects of their lives politicized, from taking a piss to Christmas to the NFL to their brands of shoes and coffee, even to taking a piss. They have been isolated from the rest of society by the demands of their Murdochian media overlords, and so they have nothing in common with the rest of us anymore. You think that'll get BETTER now that conservatives are expected to be OK with child separation, concentration camps, and worshiping the guy who forgets whether Category 5 exists EVERY YEAR?
Hannity and Trump have turned y'all into monsters, and you make terrible fans. Nobody has any reason to cater to you while they are free to do otherwise.