What an odd framing. Large scale war should always be avoided. That's a problem regardless of personal gun ownership. And personal guns won't keep governments any more responsive to the people, because governments need enough arms to defeat country-sized adversaries anyway.

Small scale 'war' should also be avoided. Guns make personal conflicts much more deadly.

The odd framing is thinking Interpol should ensure nobody is making large scale weaponry but still allow small scale weaponry.