If anyone thinks more guns is the answer to this they must be insane. In both cases it was the fear that the victim had a weapon which led to them being shot. Less guns, less readily available and better trained police has to be the only way forward.
The Yanks really do need to wake up and realise the Wild West is something which should be confined to Hollywood.
Meanwhile, 4 police shot dead in Dallas in revenge attacks.
http://www.bbc.co.uk/news/world-us-canada-36742835