1. Guns are cumbersome and heavy.
My job requires a certain amount of physical activity. It would get in the way, if not get the shit beaten out of it. I suppose I could get something smaller than a 1911, but I'm a cheap bastard. Of course, I guess I could lock it in my vehicle, but if I'm gonna carry a gun, I need to maintain control of it at all times.
Heavy-cumbersome guns are heavy and cumbersome. Not all, many are weighed in ounces and with the right pistol/proper holster, certainly not cumbersome.
Being a cheap bastard, well to each their own, but I wouldn't consider most 1911's in the cheap category.
Locking it in your vehicle is most certainly maintaining control of your firearm. The police use that method after-all.
2. It makes me nervous.
Carrying a weapon is a big responsibility and I don't know if I want to have to shoot somebody out on the street. I figure I have a fair chance of finding a corner to run around. If anybody wants to shoot me they'll have to shoot me in the ass 'cause that's the last part of me they're gonna see.
An incredibly valid point. If firearms or carrying makes the individual nervous, by all means should they avoid carrying! However it's specific to this individual.
3. It would make other people nervous.
Where I live carrying a firearm would be like having leprosy. It would make my friends and more importantly, my clients nervous. It's just not socially acceptable around here.
Under most state laws, the essential word in legal carrying is CONCEALED. Your friends and clients shouldn't be made aware that you're carrying. I personally prefer that the least amount of people know that I carry.
4. I live near a fairly affluent, low crime community.
What may come as a surprise to the OP, high social-economic bearings of a community do not rule the potential for dangerous situations.