Something to ponder, a popular philosophy question

Dear Friends,
Something to ponder;

Scenario 1:
If a suicide bomber came rushing up your driveway about to blow up your family and friends and you had a gun, what would you do?

Love guides me to shoot and stop the man to save my family and friends and self, probably lethal force probably being the only way to stop him. But answer this question: Do the ends (saving your family) justify the means (killing another human about to kill them) or the means (not killing anyone) justify the ends (your family and yourself dying)?

Scenario 2:
A man threatens to kill you and your family and friends, you have a gun, what would you do?

Love guides me to tell the police/courts and have them restrain him. I would not go and kill him. I feel that would be murder and wrong.
But answer this question: Do the ends (saving your family) justify the means (killing another human) or the means (not killing anyone) justify the ends? (perhaps your family and yourself dying) ...... Or perhaps are both important?

I recommend anyone who has issue with the idea that because God loves us He allows pain and suffering to teach us, save us, for greatest good, to answer the above questions. Everyone I'm interested in hearing all your perspectives and opinions.

Love and God Bless.
P.s: On a happier topic, check The Purpose Driven Life, an excellent book, bestseller that has profoundly affected many people, saving lives, read by a woman (Ashley Smith) about to be killed to her captor, who killed many people, and changing his heart.
Read about it below;

Books Article:
http://www.cbsnews.com/stories/2005/03/23/earlyshow/leisure/books/main682418.shtml

CNN Article:
http://www.cnn.com/2005/LAW/03/14/smith.transcript/

The Purpose Driven Life
http://www.amazon.com/s/ref=nb_ss_gw/002-7960186-2210433?url=search-alias%3Daps&field-keywords=The+Purpose+Driven+Life&Go.x=0&Go.y=0&Go=Go