What in the world, you might ask, is a "tactical" air rifle, and what is Walmart doing encouraging children to acquire "tactical" weapons. Before I opine on that, below are a few other choices the young man, who was not white and who was shot dead by police (shades of skin unknown by myself), may have found in the toy department at this typical Walmart in a typical, mostly-white affluent suburb of a large city.
So you do see, don't you, that it's not only perfectly legal for Walmart to display and sell "tactical" BB guns, it's just as perfectly legal for a young man to be carrying a real gun in a Walmart store... if you follow the logic, which I hope you can't.
It appears by every measure that the young man's real crime was to be of the wrong skin type while carrying a gun--real or BB--in a Walmart store. So, as promised, I'll leave you with some food for all your thinking: Would it have been a shootable crime for the young man to have been carrying the BB gun pictured below, also sold by Walmart, while black?