This is America, tons of people are buying ungodly amounts of guns and ammo right now. Only like 0.1% of them will ever shoot up a school (95% of them will just use it on deer and shooting ranges, and 5% will either kill themselves or have it stolen by criminals who will use it for carjackings), and courts will strike down the FBI going after people for buying ammo
What if I told you that the NSA has been doing that for the last 20 years?[0]