IMHO, keep it hush-hush. The less people know, the safer you are.
Although OCing can have a deterring effect, it might lead to the people you are worried about arming themselves against you. Like you, I admire those who OC, and do it on occasions I deem necessary. BUT, as I found out in Atlanta last year, pulling a big concealed handgun on someone can make them rethink their plans.
"The best caliber and round for self defense are the ones in the gun closest to you" - My Grandfather