Rabbi Aryeh Spero writes at American Thinker:
What is our obligation to those under fire from Islamic terrorists? Prayer is good, but not enough. Words of support are welcome, but not enough. What can one do when terrorists are not moved by our prayers or words of support for the hunted? Our religious obligation is to fight.
We fight because self-defense is a mandate from the Bible -- the Torah, called by many the Old Testament. We fight to defend life. Because life is precious, the ultimate, we must defend it. The very definition of self-defense is permission to kill the one who is coming toward you to kill you. Self-defense is not simply our right to pray or support with words, but do whatever is needed to stay alive and protect our families.