I have given this some thought over the years, and my opinion is that the concealed carry law is in place to protect the general public from the perceived threat of someone carrying a weapon without you knowing it. Theoretically, this gives them an upper hand should they be plotting some nefarious action against you.
If you carry that out to its logical conclusion, property owners may carry concealed in their business and directly in and around their house because "the public" is not there, other than by their own choice. You should know who the owner(s) is(are) and you can decide to be there based on your trust of them to behave properly.
If the law allowed the owner to grant this permission to others. the protection afforded the general public against this perceived threat from strangers is gone, since you may not know and trust everyone else in attendance.
There is limited validity to even attempting to make sense out of laws that are based on hundreds of years of past tradition and perception, but for what its worth. It's almost like doing title research, trying to trace back old laws and discern attitudes from long ago that are linked to our laws today.
Is there a branch of history dedicated to this?