Question # 1: When is it morally acceptable to kill another person? (thanks MRichards for bringing up this one)
It is morally acceptable to kill another person if they are threatening your life.
It is morally acceptable to kill another person who is in extreme pain with a terminal illness and wishes not to continue to live but cannot terminate themselves.
It is morally acceptable to kill another person should they have left statement, that if they should become unaware and incapable of coherent thought be the ravages of a desease such as alzheimer they do not want to live that way.
It is morally acceptable to kill another person who is in a persistent and irreversable vegatative state.