He's just keeping consistent with the SCOTUS decision in McDonald.
It's not so much the decision as his rationale...
"An individual openly carrying a firearm may excite passions, or excited passions may lead to the use of the firearm. Someone could also attempt to take the firearm from its lawful carrier and use it for criminal purpose."
... reads like a mantra straight out of the anti-carry playbook. Any number of things "may" or "could" happen - the issue is whether there's a reasonable probability that it "would" happen; and a judge "should" know that after all.