I found an interesting article on Vox that explain what works psychologically when you want to stop collective blame of muslims or any other group.
Not everyone belonging to a certain group can be held responsible for the acts of any other member belonging to the same group when the group itself doesn’t endorse the act. By shining a light on this by using examples, those who use collective blame can be deterred.
Muslims cannot be blamed for a single act of terror committed by one muslim any more than all christians can be blamed for what members of Ku Klux Klan does.
Read the article: