I disagree - it means everything to them because it's an illogical construct on its face. Attributing an action, violence, to an inanimate object, gun, is ridiculous and deserves to be called out every time they use the term. It means everything to them because then they don't have to deal with the icky part of the problem, people, specifically, their people, their voting bloc, their desired demographic for maintaining political power.
We agree. The violence itself means nothing to them. Poverty is a business to liberals and gun violence is used to grow the business. Their real goal is control over the people so they can further their aim of “social justice:, i.e., totalitarianism. Their “common sense” solution is the erosion of the Second Amendment—ultimately through a liberal Supreme Court. The fact that people get killed due to their social engineering is of no concern to them. It didn’t bother Stalin or Mao either.