At the end of the day it really doesn't matter on a person to person perspective. It's not as they'll change their mind on personal ownership and carry if you can convince them some guys a few hundred years ago agreed with your take on the matter.
What can make a difference is asking them why they feel firearms shouldn't be used in the manner they're opposing and use real world examples to counter their argument.
What can make a difference is asking them why they feel firearms shouldn't be used in the manner they're opposing and use real world examples to counter their argument.