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Something to consider is that even though one can, the vast majority do not. Typically, the only time I see people utilizing their right to open carry are the exact types of people you think would do that. They are a very small number in the real world. However, they get so much attention that it distorts the perception that everyone does it. I'm certain there are more people carrying concealed weapons than I pay attention to, but it's not like it is the Old West where you have to leave your weapons outside before entering the saloon.
If this is how you think it is, then you have fallen for the hype machine. Yes, lots of people own weapons. Some of those people own lots of weapons. Only a small number of them carry like you seem to think.
Most of the mass shooting events are not these open carry types. That seems to also confuse things