Condemnation doesn't work. What does work is a combination of excellent police work in routing out cells of recruiters and operators, and precise, devastating bombing raids followed by boots on the ground to protect and empower the civilians, most of whom would never support these psychopaths by choice.

If Iraq had a fully capable military(instead of the partially capable one they have now), ISIS would never have spread into the country. For all the problems the US and its allies created in Iraq, the country was comparatively much more stable, and for the most part people got on with their lives.

I think they are seeking both selective (that is, among non-Muslims) and poorly focused (at Muslims in general, rather than focused on Daesh in particular) condemnation, rather than "universal condemnation". And they seek that specifically so that the Muslims, who are the population they target to establish dominion over in the form of a Caliphate, will see non-Muslims as a threat (because Muslims become seen by non-Muslims as a threat) against whom Daesh is the only defense, and that the cost of accepting the dominion that Daesh offers is lower than the cost of being outside of it (they also want Muslims to be afraid of defying Daesh, which also makes the cost of accepting dominion less than the cost of rejecting it.)