In any reasonable discussion between reasonable people I often find it helpful to modify the stupid slogans to out the trolls.
And find the middle ground.
So I start with the standard, "Guns don't kill people, people kill people." then add the second verse, "So let's not give guns to people who kill people."
Not all gun owners are evil sociopaths.
Google "Frank Luntz gun laws" and find the results of a 2012 survey of US gun owners.
Polarized partisan shouting matches are useless.
In an environment where shooting Presidents, school children, church congregations and concert goers doesn't seem to matter.