Very few drive by shootings occur when posing for Christmas cards (which I agree is a really dumb idea, in general.) Pistols/handguns are used far more frequently in crime than hunting rifles.
Weapons That Are Most Commonly Used for Homicides
In many places having a pistol inside a vehicle is illegal. (Pistols are far more heavily regulated than hunting rifles/shotguns.) Also, recall the allegations that Ja's friends had a laser pointed at a Bucks stadium worker (or some affiliation with the Bucks.)
Its a bad look for the NBA. Plus, he was already punished once for this type of behavior, and he did it again.