But he didn't.
Neither did the other hundreds of mass shooters.
The fire department can put out a fire. Sprinklers can put out a fire. People can escape from a fire.
They cannot douse a lunatic with a gun with water and make him stop.
Apparently, nothing, absolutely nothing, can stop a lunatic with a gun and that includes another person with a gun, like the one at the nightclub who couldn't stop the shooter.
Would you support lifting the laws against bombs, because bombs don't kill people, people do? 
Would you really?