You obviously haven't watched it that much. What equals conservative is openly religous characters and more church going then has been on TV since the 50s. They poke fun at lots of leftists sacred cows. It's also extraoridnarily sophisticated and humane. What other show can work in refereces to Joyce and the like.
I don't think I got through the first episode I ever tried to watch. And that was along time ago. I like and have used the 'Having a Cow' expression. About twenty years ago I was totally repulsed by network TV. My aversion is such I just never watch network any more. My only exception is my yearly Sunday Football Ticket on DirectV. And just the network promos and commercials I see during the games serve to boost my resistance. So I remain Network free for another year.