If the guy points a rifle at police, the outcome should not be a suprise. Did he get suprised by police and turn at them with no intention of shooting? Maybe. I wasn't there, the guy is outside with a gun, they order him to drop it, and then shoot. I don't see the problem here.
The problem is that, at this point at least, it does not appear that Sturdivant ever pointed the rifle at the police. Actually, given the "I hope there's a gun" comments of the police in the video, it seems that the police may not have even seen the rifle in Sturdivant's hands prior to shooting him. If the police are given the right to shoot anyone who they think might
have a gun then we're beginning down a very slippery slope.