You can't view the tension between different peoples as individual events.  The tension between Muslims and Danes isn't over just the cartoons.

You say that Muslims 'never insult any others religion'.  For a lot of people in the west, including Denmark, this statement is not true.  They perceive, rightly or wrongly, Islam as a religion that kills innocent civilians. 

So their way of protesting about murdering, hateful and violent Muslims is to publish cartoons.  Which isn't the best way, obviously, but it's what they did.

So what was the response among a lot of Muslim people - worldwide protests which killed about 40 people, and death threats to the cartoonists.  Yes, these peace-loving Muslims who just want tolerance and understanding thought the best way to bridge the cultural divide between Islam and the west, was to attempt to assasinate these people.

So in response the cartoons are being republished.

Another boycott, not matter how well-intentioned, will almost certainly lead to more protests, more killings and MORE CARTOONS.