Jonathan Drake...I can answer your question regarding drawing of guns and when the Taser is appropriate. Guns come out when a weapon is seen or suspected. Police are trained to react to the threat. A Taser is not a good choice if confronting someone who has a lethal weapon. A Taser is best utilized in a situation where a person is acting in a resistive and violent manner. When a weapon is involved, police are trained to meet that force with equal force. Guns against guns are obvious...but many people don't understand why police draw guns against a knife wielding person. It has been proven that a knife is just as deadly as a gun in distances less than 20 feet (approx. 6 meters). A knife wielding person can close the distance faster than a person can draw a gun. FBI studies show that the majority of police involved shootings occur at distances of less than 10 feet (3 meters). A Taser is not effective beyond 20 feet. It is a matter of being able to prevail in a confrontation...cops are not paid to get injured or killed.
As too why Australia isn't like the U.S., it is simple...there are fewer guns in circulation in Australia. The risks are higher for U.S. police...there have already been 14 officers killed by gunfire this year, and 2014 registered 49 gunfire related deaths. Australia hasn't lost an officer to gunfire since 2012.