You have some implicit assumptions about anarchy there... why would there be guns? We aren't all americans you know...
Also, I don't understand the negativity, did you notice the sprawl of civilisation around you? That came from anarchy... its proven to work in some sense.
I'm not the OP but it seemed clear to me.
Right now governments conflict with each other using guns (and missiles, and drones, etc), if/when diplomacy fails.
If the law is the law of the individual, then each individual would be obligated to have his own 'defence department' if/when diplomacy fails.
I think this kid says it all best: http://www.youtube.com/watch?v=f8jUxg81o8Q
So to me a government isn't just one person, nor is it a small collective. Any other form of socialism or large scale governance that isn't based on confederation in the loosest sense with small collectives respecting each others differences, simply has too much power IMO.