“ Was he reaching for a gun in the car ?”
Maybe, while that could make it more justified in some eyes, they cant just let him drive away for a long chase where others can be harmed.
Someone recently posted (was it here) a video of a cop interviewing a domestic disturbance suspect, amiable suspect asks to go inside to get his coat, comes out, chats a bit with the cop, pulls a gun out of his coat and shoots the cop dead. Video from cop’s bodycam.