That's why it's the most important thing to make use of your god-given right to bear arms.
Pretty much every single gun rights advocate or zealot misses literally the single most important and consequential point of gun rights.
If you are being denied the right to use an appropriate level of force in order to defend your rights against invaders, you pretty much have no rights at all.
If you depend on some third party to enforce your rights, what rights do you even have?
If the robber makes use of his god-given right to bear arms, whereas you are being denied your right to do so, congratulations, the robber now enforces a(n illegitimate) property right over you and there is little you can do about it.