Why? Because they'll fuck you up? How exactly? Im not asking about presidents' personalities, what would their political friends think? To put it another way, who watches SP, and is it some marginal minority?
Depends on age, mostly: older people on all sides of the spectrum find SP crass. Younger people often think it's funny. You can find overwrought editorials about how SP is problematic/written by cucks, as it offends people on both sides on occasion.
I wouldn't say it's marginal, since everyone's at least heard of it. My general impression is that it tends to be watched by young-to-middle age college educated but middle class people, but you'd have to ask the studio to get a solid demographic breakdown.
Twenty-something college-educated salesmen do. He smokes pot, isn't on welfare, but will also work most of his life.
The intersection of class and education is too broad a topic to discuss in a couple comments, but hopefully that gives you an idea.
I guess this is as good a time as ever to not take freedom of speech for granted, that this concept is seemingly so hard to understand wherever you're from.