The Christian Taliban and School Shootings

It has seemed to me, that at the vast majority of school shootings, you can count on some Christian nujob whining that none of them would have happened if we allowed formal prayer in schools.

But the last couple of shootings have been at Christian religious private schools, where, one would presume, there is an abundance of formal (compulsory) prayer.

That would seem to me as pretty good evidence that prayer, as a way of preventing school shootings, is roughly as effective as summoning the League of Armed Unicorns.