Harden every public school in the US and use the tax payer’s money to do that with the money that those in DC would otherwise use for their own armed personal protection and as well would otherwise loot or give to other countries in order to loot it.
Right - most schools around here have done a good job using a single entrance (all other doors are exit only) and visitors must ring in for permission to enter then wait for a lock release or someone to open the door. I prefer the double door entry booth so a perp could be trapped.