Burglars in particular tend to target empty houses precisely to avoid confrontation. To bring a weapon only make sense if there is a chance of getting shot at.
Isn't "crime, done with the involvement of a firearm" also often more harshly punished than the plain crime itself? If a burglar is targeting empty houses, this would give them a strong incentive to not bring a firearm, just in case they get caught.
As the saying goes, only break one law at a time!
This has to be made up.