Does it offend me to see any portrayals of a man we don't like to have portrayed? Yea, of course. But I'm pretty sure it offends me more to see the reactions from the people involved.
If someone caricatures the prophet as a violent person, how can people [angry extremist Muslims] think that VIOLENTLY rioting and giving death threats will make the person recant that?
"You think Islam's violent!? No, it isn't. And to prove that to you, I will kill you."
I'm offended every time I see things like this - even if I'm a fan of South Park - but I do the sensible thing, I don't watch it. I can go more, say, write to them (sans death threats), or not buy from them anymore, etc. But this response just makes no sense at all.