No, because this might actually help... How the hell was a desk going to protect you from a Nuclear attack?!?
Are School Lockdown Drills the New Duck-and-Cover?
I don't see how those two things are at all the same. A close nuclear blast (so much so that it makes it through the walls of the school) will necessarily kill every child in the building, desks be damned. An active shooter, on the other hand will not.