You're logic of course is flawed.
Ask yourself why the individuals carrying out these mass killings primarily use guns? Is it because they're the best tool for the job?
Frankly you're starting to sound a little silly IMHO.
If they don't have guns the mad people just use something else and kill just as many (if not more people). The evidence backs my case:
For example:
The Happy Land fire was an arson fire that killed 87 people trapped in an unlicensed social club called "Happy Land" (at 1959 Southern Boulevard) in the West Farms section of The Bronx, New York, on March 25, 1990.
González returned to the establishment with a plastic container of gasoline which he found on the ground and had filled at a gas station. He spread the fuel on the only staircase into the club. Two matches were then used to ignite the gasoline.
The fire exits had been blocked to prevent people from entering without paying the cover charge. In the panic that ensued, a few people escaped by breaking a metal gate over one door.
http://en.wikipedia.org/wiki/Happy_Land_fire
- Should we also ban access to fuel and matches?
The killer at sandy hook could just as easily have blocked the exits and set fire to the building.