I am sure you will get a lot of replies with this thread, but I will give you some simple answers which others will no doubt expand upon.
Why not just CC?
Perhaps CC is uncomfortable. Maybe it's harder to find a holster that works well with your clothing. What if you're a woman and don't have a good on-the-body location to conceal? What if you are too young to apply for a permit? What if you want people to know that you carry a firearm? What if concealed carry makes you feel like you somehow have something to hide, like a common criminal? What if you don't want the goverment having your records on file by applying for a permit? What if you believe that we shouldn't even need a permit to carry a firearm? What if you hope people will see your carry of a firearm and start to regard this sight as normal, thereby minimizing the irrational fear of weapons pervading our society? Just a few reasons. I am sure there are more... so, no, CC might not be more advisable. Even tactically speaking, there is no evidence to support the claim that OC'ers are targeted first in a shooting/criminal encounter. This is pure hearsay, but I see the point, I just disagree. I think more crimes are prevented by the open carry of firearms than ever were stopped by the use of concealed firearms. But then again, there's no evidence to support that either, so it's just opinion, no fact whatsoever on either side. Anyone who says otherwise is just fooling themselves.
The only places that I can see OC as a bad idea are those where carry of firearms is illegal. If you can CC someplace, why shouldn't you be able to OC there as well? A bank perhaps? Do you think it reasonable that the teller ring the panic button as soon as someone with a gun on their hip comes into the bank? I don't think it is, there might be a lot of false alarms there. How about they ring the panic button when the person has shown themselves to be a threat - like shouting out orders or threatening violence or force? A gun is a tool, plain and simple. Some people feel that this tool is somehow magical and goes around shooting people all by itself. Somehow every gun is evil because all guns cause death. Guns aren't evil, people are evil. Guns don't cause death, they fire projectiles that potentially damage tissue and cause the person/animal to die. It's fairly simple, but someone always has to be on the firing side to effect this outcome, therefor blaming the tool is somewhat assinine when you sit down to think about it.
If you feel uncomfortable carrying openly, I think that's rational. It's not for everybody. I don't think prudence is much of an argument however, we're in the business of living our lives the way we see fit (inside the confines of the law), we're not out to make everyone feel warm, fuzzy and comfortable all day (people who want to feel that way need to realize that life has nothing to do with constant warm fuzzies).