Hmmm, was he attacked for OCing, or attacked for giving the perp the evil eye?
At any rate, OCing doesn't provide absolute prevention of assaults by crazy people.
If anybody wants to hold the victim up as an example of what not to do, they should focus on his empty chamber more than his visible holster.
As Owens points out:
Mr. Walker typically conceals his full-size carry pistols, but decided to leave his jacket in the trunk on what he expected to be a quick trip with his three older boys for a batting helmet, some baseballs to toss around the yard, and a few other items. As he was helping his sons find a batting helmet that fit, he noticed a disheveled man come down the aisle and made eye contact with him several times.