If we had the power to eliminate the evil that guns are supposed to countervail, then yes - so long as we did not also eliminate the evil that guns may enact, in which case it wouldn't matter if gun ownership persisted so long as the evil that they countervail were first eliminated.
God has created beings with the ability to make choices.
Then God's choice has consequences, and the consequences include the choices that would then be made by the created beings.
You have a very simplistic approach to theology
The approach is called "rational" - as opposed to these mental acrobatics trying to make the irrational appear to be rational.