Yes, but there's always a lot of selectivity in fact-reporting. The Columbine killers were most likely from families that were at least nominally either Christian or Jewish, but I don't recall the MSM specifying their religious background in regular reports (in-depth article like NYT magazine features, etc., probably did). In that light, I find it hard to see an MSM conspiracy to minimize the threat of extremist Islam, in the fact that few articles about this incident mention the family's religion.
This is a statement that is so fuzzy it can neither be proven nor refuted, therefore it has no legitimate purpose except to "spin" in the direction that is favorable to your thesis.
The Columbine killers were most likely from families that were at least nominally either Christian or Jewish, but I don't recall the MSM specifying their religious background in regular reports (in-depth article like NYT magazine features, etc., probably did). In that light, I find it hard to see an MSM conspiracy to minimize the threat of extremist Islam...
But let's examine that "light."
It is the assumption that Islam is, in some sense, interchangable with Christianity and Judaism. This is an assumption in need of support.
Were they or weren't they? That is a provable/disprovable assertion, and I think I would have researched it further before making any statement about its probability if I were you.
In addition, I would like to see some compelling evidence for your earlier claim that most murderers are from "at least nominally" (nice wiggle room) Christian families.