Another question is how would the USA have reacted if the Muslim nations attacked Abe Lincoln because he was killing other Americans?
I think it would have brought us together as a country and we and our militias would have counter attacked our invaders using any means possible.
When other countries and other cultures invade, the residents will usually repel it. That’s human nature. The Christians are outsiders in Libya and it will probably unite their country against us, just the same as would an invasion of the USA in 1861.