1. A complete gun ban WOULD lower shootings and murders, as a natural consequence of removing an effective tool.
2. A complete gun ban is practically infeasible in the US.
3. 95% of gun violence is done by niggers in ghettos. Fix the ghettos and rates of US gun violence suddenly equals European countries.
4. The macro benefits of the 2nd amendment (armed citizenry in case of government tyranny) is a worthy trade-off and a literal fundamental building block of our country.
5. Criminals and schizos will find other means for violence with a gun ban, especially if they want to commit mass killings (e.g. European knife attacks, truck of peace, illegal acquisition of guns)

tl;dr leftists are retarded. Conservatives who say a gun ban wouldn't lower violence are also retarded, that alone is a losing talking point.

Focus on a ban being impractical and 95% of shootings being committed by blacks in ghetto. Leftists have no counterargument to that, because it's true.