Considering that gun owners portray themselves as "law abiding gun owners", it's generally assumed that should by some warped reality they repeal the second amendment, that these people would be "law abiding former gun owners".
Then again, that's also assuming that the argument is made in good faith and not as a deflection to push for unfettered gun proliferation. Liberals like to assume the best in people after all.
If you're only law abiding when you like it, then you're not a law abiding citizen. That's kinda how it works.