Probably didn’t occur, but the gunman might have picked the wrong address, and hit the wrong family. A real pro would have not stopped until all members of the family were dead in the house.
You make a point. Way to little information to really be sure what actually happened here.
Maybe the real pros are all dead. If SOP for the deep state/clintoon mafia is to hire a hitman to kill someone, and they succeed, then SOP would also be to erase the hitman and thus create a dead end - pun intended - for investigators trying to follow the lead.
Eventually you're going to have to pull in back benchers.