Well, the Indonesian people were recently subject to a gun and bomb attack in the capital city Jakarta.
Only two died if I recall correctly, the attacker and one other.
the Indonesian people quickly launched a hashtag for WEARENOTAFRAID, in the Indonesian language. Openly mocked ISIS, and laughed at their pathetic efforts.
It worked for an 80% Muslim country. The world should be mocking ISIS and their crazy madness, interspersed with bombing the hell out of them. They have no political goals, they have no desire to integrate, they want to obliterate all who are not them. That is insane thinking, and we need to reinforce this viewpoint by mocking them at each and every turn.
It doesn't do to rationalise them, or to barter with them, or speak to them, mock them, kill them, end the caliphate.