Why is it dumb? We don't know what he is carrying, we don't know where he lives or what he does for a living or what he has to face in his daily routine.
It's dumb because unless you're a cop or a soldier, or maybe an armed bodyguard, there's no legitimate reason to carry more than one gun.
We carry concealed for our personal protection, and the protection of our loved ones that are with us. We don't need an arsenal strapped to our bodies to provide that protection.
What are the chances of actually having to shoot a weapon at someone? Extremely slim.
What are the chances that your gun will break at any particular time? Extremely slim.
So, combine these. What are the chances that you'll need your gun and it will fail at exactly the wrong time? If you take care of your gun, and are proficient with it, this will be so rare as to be nearly impossible.
Think about it... How many police officers carry multiple handguns? Two of my best friends are cops. I've asked both of them. Neither of them know any fellow cops that carry two guns.
Now, if cops don't typically do it, and they use their firearms all the time, then why should you? Chances are, you'll never need to use your gun anyway, in your entire life.
Something else to think about: The worst case happens, and you draw your firearm and shoot the bad guy. You will be questioned, and you will likely face a grand jury to decide whether or not you should be prosecuted. Simply being someone who carries a gun will be bad enough for many of the anti-gun people that will sit on that jury. If they find out you are carrying multiple guns, a knife, and so forth, many will think you a nut, and will be more likely to run you through the legal system. This will be expensive for you, and could turn out very bad.
I believe that people carry two guns, not because they need them, but because it makes them feel cool and tough. Now, it's up to you to decide whether to do it or not. I won't tell you you're wrong for doing it. However, I think it's dumb...
Select your carry gun with care. Keep it clean, lubricated, and well-maintained. Be proficient with it. If you live in a more dangerous area, then carry some extra ammo.