That would make you a gun control advocate too and that argument doesn't work for guns or agressive breeds of dog.
Agressive dogs need time and expertise to be uised properly, so do guns. Deadly force in dogs and guns is the same and requires often extraordinary care and foresight. The people who train in that care and fcoresight should be the ones to have deadly force available to them, those that do not form a greater risk to society.
You act as if these dogs are nothing but machines.
The fact that a normally-placid pit will, frequently, snap and start mauling anything and anybody in its vicinity is proof that, no matter how much training you provide, these beasts will revert to their genetic breeding traits eventually.
Comparing them to a gun, which will do what I want it to do, every single time I want it to do it, is ridiculous.