Not enough t' cause bloody genocide on it's own, obviously... well, to anyone with common sense lawl. Indeed, facts are misconstrued just like this either by preachers corrupting knowledge deliberately for an improper purpose (for example, politicians with an agenda against gaming using stories exactly like this as propaganda), or the raw facts bein' outright misunderstood by the derptastic masses of humankind. 'Till people stop bein' stupid and uninformed; that'l certainly never happen; issues like these ain't gonna be prevented due to cause and effect.
Everyone is always too focused on the channel or tools the crime was done through, not the reason why the crime came to be. In this case, the issue is the mental case behind the massacre. Everyone's gonna moan over gun laws and video game violence 'till this crime is forgotten and as a result, very little t' no progress will be made towards tackling the source of such problems.
Civilization is a beautiful thing.