A NECESSARY evil. Not a sin, but the result of fallen nature. Surely you can agree that it’s unfortunate that we must resort to the use of deadly force, or the threat thereof, to be at peace?
There will always be evil. Guns, by and of themselves, are not evil. The defense of oneself against evil is noble and the antithesis of evil.
In your perfect utopia there is no evil. In the real world you have a right - some would argue a responsibility - to fight evil.
The second amendment was drafted by men with first-hand experience in having their freedom denied. To call it a necessary evil is an affront to natural law.