The vast majority of Muslims practice the Islamic religion.
There are Islamic fundamentalist sects withing the Islamic religion.
It was Islamic fundamentalist, jihadists who committed this violent attack.
There's an argument that states the continued excuses given to the entire population of Muslims for the acts of their fundamentalist, jihadists brethren weakens the impact and leverage of the more moderate Muslims of the Islamic faith to marginalize and control their fundamentalist, jihadists brethren, i.e. to make them give up their Jihad against the West. If you continue to make excuses for them, and continue to appease them, it only emboldens them to attack more and more violently.
This really is a religious war. A religious war that's being conducted by the Islamic fundamentalists at their own choosing. These Islamic fundamentalists will not stop their religious war until their are dead. It's part of their very being. This also makes them completely unreasoning and not negotiable on this aspect of their religious war.
The West needs to come to grips with this reality, and stop treating it like a law enforcement and police matter, and treat it as most any war would be, with the military and an aim to stop the attacks by killing the aggressors, wiping out their infrastructure, deny them land to operate, and to destroy their ability to operate as an effective force, terrorist or otherwise. Continuing to treat this religious war as a law enforcement and police matter is seriously wrong headed, and is sure to only do what Obama's shift in policy has accomplished, which is to further embolden them.