As far as I know he is a suspect and should be brought in for questioning. Nobody should be shooting him unless he is actively shooting at them. So, no police officers and no drones should be shooting at anyone. How do we even know he really wrote that letter? For all we know someone set him up. Everyone deserves a trial. When did we become a country of assassinations?
Look at what random shooting has caused in this instance....innocent people being shot at and harmed.