I think you guys are missing the point. Think from the standpoint of the lay-person here. They don't know airsoft guns, they definitely don't know real steel either. The lay-person kind of panics when they see a gun of any kind other than a bright pnk and yellow squirt gun. Bottom line is that the one dude shouldn't have been walking to get his mail with a gun of any kind (unless licensed w/ a CWP and it is hidden).
With the kids running around with AS guns, the theoretical little old lady who sees a group of kids with real looking guns just thinks about the school and post office shootings, not whether or not they made an actual firing sound or anything. They aren't "idiots" for thinking this way when they have no idea that they are replicas that shoot plastic pellets.
We have to be overly careful, and not assume that everyone knows they aren't real guns. Period. Most of us do that, it is just these idiots who ruin the repuation of our hobby.