I have. And IIRC, it’s NOT EVEN A PHOTO OF MICHAEL BROWN. It’s a photo of somebody else entirely that was used to advance the “Michael Brown Was A Thug” narrative (and, for that matter, posted by a police officer).
Even though, btw, guns would have been completely legal for Michael Brown to possess at that time. You can’t use a photo of a person holding a gun in a photo to prove that they’re a bad person who deserved to die, unless you’re prepared to do that for ALL people who hold guns in photos. And if you do that, the usual suspects any time a gun control debate starts here will probably have words for you.