Source: The Probability Broach
I think it's clear that guns didn't "end" the concept of brute force.
Intelligence is what superseded brute force. Guns were (and to some degree remain) a solution. But guns remain yet another (if lesser) form of brute force, and intelligence must continue to refine its methods.
Guns are, like all things, another tool in the toolbox.
But the armed force that is needed to defend/construct social democracy is a force with the weapon of intelligence. If that intelligence deems guns the appropriate tool for a particular task, so be it. But the sentiment that guns are the answer is a favorite of the (now lazier) brutes.