Low murder rate in Vermont is not because of easy gun access....it's because it is VERMONT.
There are just different demographics up there. No large urban areas where poverty mingles with affluence.

   But don't fret...Vermont will gradually accrue a population that sees how 'useful' guns are when folks disagree or want their neighbor's TV. You'll have 'interesting' statistics in a few years.

(prove it? I can't prove it, but I'd make a small bet....and hope I lose.)