People with guns are definitely killing people.
The U.S. second amendment is clearly, should you look at its historical context, meant to guarantee citizens the right to bear arms precisely to resist an over-reaching state. Emphasis mine:
"In a 5-4 decision, the [United States Supreme] Court, meticulously detailing the history and tradition of the Second Amendment at the time of the Constitutional Convention, proclaimed that the Second Amendment established an individual right for U.S. citizens to possess firearms and struck down the D.C. handgun ban as violative of that right. " --https://www.law.cornell.edu/wex/second_amendment
The U.S. Constitution is the instrument whereby the Citizens of the United States delegate the partial exercise of *their* sovereign power. That instrument specifically forbids disarming the citizenry. The interpretation that 'militia' somehow puts that power right back in the hands of the state is without merit.
Because it is so clear in protecting individual rights, the U.S. constitution acts to some extent like a proxy for what is the sensible intent of a citizenry as a collective.