Honestly I haven't seen that much ultra violence in modern South Park. Don't get me wrong, there IS but not as much as there was once (see the Imaginationland saga and that one Christmas episode with the Satanic Disney-like cute animals) and the show is still more concentrated on the topics rather than the violence. I'm talking about stuff like black fridays, the NSA, the Royal Family wedding thing, freemium apps, Scientology, abortion, Mel Gibson's The Passion, the console wars, Osama Bin Laden right after 9/11 (that was done tastefully, there's a review by the Nostalgia Critic about his 11 best SP episodes with it in it: you'll see what I mean), people that deny about the Holocaust, Al Gore, Michael Jackson, dead stars, celebrities' photoshopped images...
I think there's more but that's just everything I can remember of.
Anyway all this stuff is taken into satire in different ways, not just blood and sex. It ranges from "Holy Mary is bleeding from her anus" (now rarely) to "Osama has farty pants and acts like a goof from the Looney Tunes".
I'm sorry if I sounded upset, I don't want to start a flame here, but hearing someone saying that if Mr Pickles is bad because of ultraviolence then South Park must be too seems just a bit superficial.