They knew very well it insults ALL Muslims worldwide, the good and the bad...
Yes. The issue is that the attack wasn't on the people who just go about living their lives, or even just on the people who deserve death for the atrocities they commit daily - it was an attack on the concept of holding something as simple as imagery in such high regard. It was a point that the cartoonist wanted to make and had every right to do so, in a form as simple as satire.
There are literally thousands, probably tens of thousands, of political satire cartoons produced every single day. Should we refrain from ever creating political cartoons because members of certain political parties don't have a thick enough skin to deal with it, let it roll off their back, and get on with their lives?
Type in the words "Jesus Meme" into google image search and you'll get nearly 1,000,000 hits, most of which are irreverent. Should no one ever make joking Jesus references because some people just can't handle it?
People who like big trucks make fun of people who like small cars.
People who eat meat make fun of people who choose to be vegetarian.
People who like guns make fun of pacifists.
People who like bright colors make fun of people who only wear dark colors.
(And vice versa on every single account like this)
So what?
This is how society works. Jarring is a very human part of social construction. Satire and mockery, and yes even to the point of insult, are part of who we are. I actually just finished a fairly heated argument with a friend of mine over a theological debate. At the end of the debate - nothing changed for either of us - I think he's an idiot for some of the beliefs that he holds and he probably thinks I'm a hateful little ****, but so what? We're still buds. We're still gonna have lunch with each other tomorrow. We still respect each other. The only difference that divides us, and that we make fun of in each other, is one.
What the cartoonists, and anyone who produces satire is mocking, is an individual aspect of what he views as an outdated belief that is, according to you, very widely held in the Muslim world. If he knew full well that it would be an image that would reach even the furthest parts of the world, and generate a conversation about the usefulness of the idea of the sanctity of a religious figure, then he kind of did what he wanted to do, didn't he?
If people weren't so overly sensitive about something that, at the end of the day, isn't even that big of a deal, then the images would stop being created.
When's the last time that someone made a political cartoon about Marie Antoinette?
See what I mean?
The fact that there is this much conversation about a cartoon from a long time ago shows how pervasive and sensitive the issue is - and we're just talking about a damn cartoon, which, as I mentioned earlier, is really the simplest thing ever and not a big deal whatsoever - yet here we are.