Essentialy it all comes down to symbols, and how much they mean to people. While religion has lost some of its effect in Europe, and the U.S. (being a Costa Rica, I can say that religion is still pretty strong here in Latinamerica), symbols regardless of their kind will trigger a whole spectrum of responses from people:
Let's say that Gazzetta publishes a cartoon of a gay Del Piero or the whole Juve squad engaged in a gay orgy? For us fans that's a really strong symbol really getting thrashed. Sure, Inter/Milan/Roma fans will find it funny, or at least smirk. Juve fans would rather react in all possible manners, some would ignore the stuff (if it's silly why bother with it?), some would boycott Gazzetta, some would trying to get anyone to censor the stuff they publish, but they'll be some tifosi really wanting to get back at the cartoonist and have revenge. Do they represent the most of the fans? Is their reaction the best?
It's also a matter of taking up personal responsibilities, each person should know better than to insult someone else, or their beliefs. Freedom of speech entitles you to say what you want, about anything you want, as long as knowing when to limit yourself. Each right, each freedom is accompanied by a 'duty' to fulfill, in this case, it is a matter of not using 'freedom of speech' as an excuse to insult people.
This whole Danes vs the Islamic World is like children bickering in the kindergarden. A few pages back someone said the muslim world is about 500 years behind, essentially the whole world is 500 years behind. Ethically speaking the whole species is underdeveloped, compared to our technological achievements.
About the censoring youtube, that sure wasn't the wisest decision at all, but at a government level there a lot more of politics at play than the matter of the cartoons. For some muslim countries, it's yeat another chance to 'show' their moral superiority compared to the putrid western world, the Danes on the other hand, will say that muslims are immature kids that cannot take a joke and that they are overreacting. So Pakistan chose to close the most evident and popular symbol of Western-oriented globalization. Pressure will eventually reopen it, and it's not like there are other alternatives. (veoh, myspace.tv, nsfw, etc)
Bottomline, they are completely different civilizations, the Western civilization is definitely more jaded, more used to have all their heroes/symbols reduced to cartoon stuff. But even so, the Brits react when they make too much fuss out of their Royal Family, the Americans get annoyed when they are mocked over being a lot of ignorant fools, Germans react heavily when someone uses their Nazi history as a plot for mockery. (bottomline's, bottomline) respect each other: a normal human doesn't go around insulting their fellows, for a lot of reasons, mostly because there's not much to gain from that. Respect the other person, their beliefs, race, gender.