Which "schoolchildren" died because of a firearm that was purchased inside of a 30 day window? None of the famous massacres would fit this bill; did you have an actual, documented event in mind or just feelings?
All of the gun grabbers I am aware of that are in favor of waiting periods try to make this infringement justified based on "crimes of passion" and other "heat-of-the-moment" nonsense - not "schoolchildren."
They don't have any evidence because they are appeals to emotion.
If you look at the people doing the shooting you get a much better correlation but no-one wants to go there.
It's just an example, you're refusing any kind of gun regulation, doesn't matter what it is, dead kids is not a factor.
Casual gun ownership is the difference. In Europe you can get guns, but you do it for a purpose like hunting or sports, license and training is required.