Muslims have engaged in frequent peaceful protests with regards to cartoons that depicted Mohammed. Unfortunately when you have frequent and worldwide protests on any hot issue clashes sometimes erupt and violence occurs. This of course happened with regards to these cartoons. The worst incident I know of was a clash between Christians and Muslims in Nigeria that left 127 people dead.
Many atheists have decided that because of this it makes a lot of sense to be a massive prick and stick your finger in the eye of the entire Muslim world, including the vast swaths of Muslims that protested peacefully. Let's all draw Mohammed. I guess the thinking is that the world would be much improved if we all treated those that think differently like crap.
It's interesting to note the selective outrage of some. The Muslim country of Iraq was invaded on a pack of lies for reasons thinking people know had to do with the control of resources. Around 1.5 million dead. Prior to this Iraq was subjected to a starvation campaign. Maybe a million dead. Muslim nations have been subjected to vicious puppet dictators by the United States for decades. These things aren't noticed. These are things that are going on today and could be stopped if people could figure out which things are really worth objecting to. Instead we will focus on a small handful of idiot Muslims and how they became violent. The speck in our neighbor's eye is a problem. The beam in our own eye is irrelevant.
Unfortunately Hemant Mehta, the so called "Friendly Atheist", is promoting this. You can read his reasons and my objections in the comments section here and here. I like Hemant and really he is a friendly atheist. He may have gotten swept up here by the atheist community. He probably won't see the light quickly enough to pull his support before this incident proceeds, but I hope that he will change his thinking eventually.