Is it to like establish justices, insure domestic tranquilly, provide for common defense, to promote general welfare, to secure the blessings of liberty.
Go read more on http://www.forerunner.com/mandate/X0043_Five_Functions_of_Go.html
The use of violence would not limit the effectiveness. It would aggravate it, actually, enough to land you in prison for a long time with no bail.
Answer:
Explanation: to save people that are still alive and not let them die slowly