I make sure my weapon is concealed for the same reason I carry my wallet concealed. well, there's actually more than one reason, Ohio doesn't allow open carry but, why invite problems?
The general public is perfectly happy to believe that there are no guns around them, why alarm them? And, kids, idiots and bad guys dont need to know either.
Way back a million years ago I worked on ATM machines and did after hours repairs. I open carried then in plain clothes and ended up in some of the weirdest places at the weirdest times.
I actually had a perfectly sober college kid come up to me as I was repairing an ATM in the Student Union and ask me what I'd do if he tried to grab my gun.
I told him that we'd be wrestling for the gun at that point and if I win, he's dead.
He got this surprised look on his face and said "learn to take a joke" and walked away.
People are stupid, all of them, at some point or another, are just as dumb as the guy who cut you off on the freeway this morning. Some are even stupider.