I was only talking about general mainstream Muslim culture which is promoted.

Well, again, if you are saying that "left-leaning political elites" are promoting Muslim culture or openly encouraging it to be promoted, then I still simply don't believe you.

I dare say it's true that ISIS would prefer a mainstream Muslim Europe to a mostly Christian and secular Europe, and that it would generally prefer a more-Muslim Europe to a less-Muslim Europe. (Though ... I wonder how true that is; they might actually prefer an aggressively anti-Muslim Europe with which they could have a glorious fight ending in the domination of ISIS-style Islam.) But a process whose best-case-for-ISIS outcome is a mainstream Muslim Europe in several decades (personally I think even that is a ludicrously paranoid scenario, but I hope we can at least agree that it's the most ISIS could reasonably hope for from those "left-leaning political elites") cannot possibly make it unnecessary for ISIS to act more drastically to spread their ideology.