I was the first one on the comment boards to say exactly that, that this was a despicable act, condolences for the victims, that there is no excuse for mass murder, etc.

"Instead there are calls for Muslims to speak out and distance themselves. " I haven't, you must be generalising because some others do. 

But there is, nevertheless a significant difference.  If the perpetrators are claiming they are doing it in the name of Islam, if  the group encouraging them to does,citing chapter and verse of scripture claiming that it is their duty,  then anyone claiming to share the same religion should speak out or risk being put in the same boat.

Just as if there are groups that commit crimes in the name of Marxism, or anarchism, others claiming to be Marxists, or anarchists, should make clear they disapprove, or risk being blamed.

I have seen nothing so far about Bissonnette claiming he did this in the name of any group, ideology, religion, etc..., everything is just speculation.