Our response to the Christian is this:
Everyone as the human right to defend themselves and their families. However, Dovid it is far better to teach people how to come home to their own souls; to ensure that self-defence with guns, is not a necessity by anyone.
Do you have that ability Dovid? No.
People cannot teach others how to teach their souls to fly divine, if they have not done it themselves.
The law will go out from (ELI) Zion, the word of the LORD from Jerusalem. He will judge between many peoples and will settle disputes for strong nations far and wide. They will beat their swords into plowshares and their spears into pruning hooks. Nation will not take up sword against nation, nor will they train for war anymore. Everyone will sit under their own vine and under their own fig tree, and no one will make them afraid, for the LORD Almighty has spoken. All the nations may walk in the name of their gods, but we will walk in the name of the LORD our God for ever and ever.