The fear seems to be that access to guns quickly leads to normalisation of guns, especially if the criminals try to keep up.

But I can imagine a middle ground where guns and training are available, but you have to get permission from a specialist who’s on the hook if it turns out the guns weren’t justified (or some such idea to stop them ending up in every action) to unlock the gun safe. Then the “domestic with a shotgun” scenario might be resolved a little more efficiently without everyone having to accept guns everywhere.