Riddle me this...
Prohibition lead to crime, organized crime and was deemed a dismal failure.
The War on drugs is typically disparaged by many of the same people who support gun control, because it creates power within criminal organizations.
But you think that organizing prohibition on weapons is going to keep someone motivated enough to shoot up an elementary school from doing their harm?
I'll be damned if I'll allow the same government who intentionally shipped weapons into the hands of Mexican warlords is going to take any of my rights as a law abiding citizen away.
When atrocities like these are committed, the criminal is already fully aware they are breaking multiple laws and committing multiple felonies. They've likely stolen a weapon, ignored the "no guns beyond this point" sign and used it for their crime. The only thing limited by gun control will be the possibility that some honest, private citizen can stop it before more people die. Throwing my can of soda or tub of popcorn isn't likely to do it.
"Silence is Golden. Duct Tape is silver"