Although OCing can have a deterring effect, it might lead to the people you are worried about arming themselves against you.
That's what I'm getting at. I can't completely pull off the "harmless" look... I'm 6'4" and weigh 260. I'm not fat either (though admittedly I could lose 25 lbs and look good). I'm more than likely already considered a threat on the street anyway. I don't really like that, but that's the hand that God dealt me. I'm pretty sure these folks are armed, but I don't think they would use it. If they do surprise would be one of the better things going for me. They ARE amatuers, but I would rather not advertise that fact to them until and unless they force me to.
The good news is I think the situation is beginning to wind down.