Now that I think about it the same thing has happened over and over again, for instance Communists.
There's a certain pattern in some of the comments on that news page. Certain "ALL RELIGION IS BAD!!!!!!!!" comments are there, and if no one's been cheating with the voting, these comments seem pretty popular.
What you mention in your post reminds me of such people's blind spots--if a Muslim does something bad, then it's Religion's Fault instead of anything in particular about Islam, and atheists (especially the State Atheists of communism) have never, ever committed atrocities in the name of their beliefs.
That's kind of a quasi-Alinsky rule of the modern Left. Every event must fit into The Narrative, which is resolutely anti-Christian, anti-capitalist, and anti-Western.
If an event directly contradicts the Narrative, then they play tricks with the scope of the story and they scale the Narrative up or down accordingly. A lefty or Muslim murdering a dozen people becomes either scaled down into an unimportant Local Crime Story (TM Ace), or, more likely, is scaled up into a Larger Issue, as with the above story.
Muslim terrorism means: Religion is bad.
Massacres by leftists or Muslims mean: Guns are bad.
Chernobyl means: Nuclear power, not Communism, is bad. Etc. Etc.