Let me start by saying I appreciate this hasn’t devolved and does seem to be a civil discussion.
The idea is most citizens are law abiding and if it is illegal to conceal carry or barred by the establishment to carry then only three types of people would be a threat to someone who intends to cause violence. First a law enforcement officer, second another person intended to break the law with a weapon and last would be an individual with the attitude’rather be judged by 12 than carried by 6’. The possibility of those types being in the vicinity is much lower than when everyone can be capable of self defense with a firearm.
There are many more nuances involved: does the person carrying have training? Can the person carrying be more of a danger than the danger their presence prevents? Is the criminal logical/smart enough to know and understand that there is a risk of an armed populace when they enact their crimes? And many more variables that can be put into play that aren’t part of this discussion.