that the focus of the self-defense right is in the home.
Not necessarily. That just happened to be the extent to which Gura was willing to push the supreme court in Heller. And Heller is what the 9th circuit was relying on.
Limiting the case (Heller) to carrying on the home was wise for the argument at hand, because it focused the Supreme Court on the one place in which most folks consider the right of self defense to be sacred. It may have even helped get the desired ruling.
Now that we have 2A as an individual right, and incorporation in the 9th, it can (and will) be argued that fundamental civi rights don't end at your doorstep.