Flying Pig, let's put that bluntly, I'm far to be convinced any European or North American government involved in the conflict against ISIS is particularly comfortable about it.
We know that it's giving pretext to Salafists to recruit even more against the kufar West killing muslims and that we're losing ground on an ideological level in doing so. However we would lose much more than that if ISIS would take over Damas, Baghdad, Beyruth, Amman. If you believe that letting them do so would make ISIS peaceful towards us, then you're just dreaming.
No matter what is done will necessarily have harmful effects on us. And no solution can come from the West in this conflict. This shouldn't be our war but we've been brought into it by the wackos in front, who do want to make the thing global. 25,000 people coming from 80 different countries (including 7,000 from Europe) have joint ISIS even before any Western country was involved in the civil war in Syria.
We didn't ask for it. And for the matter, France was against the war in Iraq, France always defended the rights for the Palestinians, and this hasn't prevented the country to be the one in Europe from which the largest contingent of citizens went in Syria to fight within ISIS ranks. One thousand and two hundred French citizens are currently there fighting, as we speak.
War is not a solution. Some in the past believed so but they were proven wrong. However indifference is neither a solution. Sometimes crappy situations are just that: crap.