Because they stink just by being around, and skunks aren't like possum and coons in terms of being so prolific in an area. I agree it's a shame they are such vile creatures, as they are very gentle and potentially make good pets once the glands are gone "so I hear".
I'll probably get banned for this, but I can't help it:
Joe Bob and Elmer were sitting on Elmer’s front porch, when a skunk walked up the front steps and into the house.
Joe Bob said, “Holy crap Elmer, a SKUNK just walked into your house!”
Elmer said, “Oh, yeah, I saw him. He’s our pet, his name is Zeke.”
Joe Bob said, “You have a SKUNK for a pet? Man, how does that work?”
Elmer said, “Works great. He’s very clean and gentle, goes out and finds his own food, and he’s very affectionate. He sleeps right up on the bed with me and the wife. In the winter he likes to snuggle in between my wife’s legs.”
Joe Bob said, “Well, yeah, but geeez…what about the SMELL?”
Elmer said, “Well, when it gets to bothering him, he goes back outside.”