We have to fight or wage the righteous war between good and evil, which is the spiritual war going on the spirit realm reflected here on earth, and we are in this war whether we like it or not... However, "how" do we wage this war in a Godly way...?
Most would say "with words" and prayer only, and by love and by conduct and example that reflects love, and no physical fighting... But, there are times when words are "not enough" or fail us, or are ineffective... Words work a lot of the time in a country like America, but sometimes not so much in others... And humans sometimes take much greater notice of actions than words...
Terrorism is evil... ISIS is not committing these attacks cause they want to be heard, but because they want to wipe everyone else not Muslim off the face of the earth, if they had more power or get more power in the future, they would do the same as Hitler or even worse than Hitler...
If that is not evil, I don't know what is... We have to something to put a stop to it/them before that happens, they are forcing us into a corner, we have little choice but to physically fight and subdue them, if it is even possible to subdue them, if it goes to far, "we" may be forced to wipe "them" out, though many of us do not want to, myself included, but they leave us with very few options, they don't want words, they don't want reason, they don't want peace...
Star Trek TNG episode "High Ground"... (see this clip)...
You really should watch the whole thing, it is very relevant to today, right now...
Data says "Would you say that terrorism is acceptable when all options for peaceful settlement have been foreclosed..."
And he is right... Also, "war" is "necessary" when all options for peaceful settlement have been exhausted or foreclosed...
That is where we and most of the world is "at" with ISIS, and while they might say that according to Data, they have a right to fight the way they are fighting, but "we" also have a right, when all options for peaceful settlement have been foreclosed, to do what we "must do" to stop them, which when all options for peaceful settlement have been foreclosed on, involves killing them...
God Bless!