"Do not repay anyone evil for evil. Be careful to do what is right in the eyes of everybody. If it is possible, as far as it depends on you, live at peace with everyone. Do not take revenge, my friends, but leave room for God's wrath, for it is written: "It is mine to avenge; I will repay," says the Lord. On the contrary:
"If your enemy is hungry, feed him;
if he is thirsty, give him something to drink.
In doing this, you will heap burning coals on his head."
Do not be overcome by evil, but overcome evil with good."
(Romans 12:17-21, which quotes Deuteronomy 32:35 and Proverbs 25:21,22)
For as long as western leaders meet threat with threat, act of aggression with act of aggression, the terrorists that they pursue have won the war.
For as long as the response of western populations is a determination to carry on as normal - where normal is to eat food produced in such a way that imposes hunger on others, and wear clothes produced in such a way that imposes poverty on others - there will be no decline in the supply of fresh terrorists.
To the extent that we choose to do what is right for humanity, as opposed to what is expedient for a few, lies the hope of overcoming acts of terror - perpetrated by both self-appointed terrorists and democratically elected governments.