And you can back up your speculation with the studies that support this?
In my experience, those that actually practice open carry usually do so on their own premises and not generally paraded on the metropolitan streets.
I'll agree that it isn't a 'bright idea' for anyone and everyone to carry openly just because they can. It shouldn't be, but it can sometimes be misconstrued as hostility in those areas unaccustomed to seeing armed civilians.
But I'll openly challenge any assertion that open carry is equivalent to wearing a "mug me" sign. I won't believe that armed people are intentionally mugged or robbed more often than unarmed.
I doubt an open carrier would get mugged, but I expect they get their guns stolen from them a lot more often than concealed carriers. "Grab and run" is the likely scenario, not "grab and stick around and try to use it".