They are a bunch of murderous scumbags
The civilised world needs to pull its finger out and get medieval on them
Oh, you want civilised world to put them down? To kill more people? Lol
Exactly. You can't really pretend to be the more civilized party or country when you resort to stooping down to their level. People get angry because a westerner has been beheaded, but don't seem to mind when their armies blow civilian children to bits in the process of getting "justice" or retribution. You can't fight terrorism with more terrorism.