Of course it's hard to do, but that doesn't change the fact that getting rid of most guns is clearly and obviously the way to significantly reduce the amount of gun violence in the US. Contesting this is too silly to take seriously, like an alcoholic saying "I know I've been fired from my last three jobs for showing up drunk, but we have lots of other avenues to address this..."

And just because it's difficult doesn't mean it's impossible. If one side can stack the Supreme Court with people who suddenly realize there's no constitutional right to privacy, the other side can find some judges to suddenly notice the "well-regulated militia" part of the second amendment, and act accordingly.