It's left wing sarcasm, you say? Re-think that, if you can or will:
When refugees are stuck in refugee camps, get turned back from Europe {or any other nation}, or suffer discrimination upon arrival, it helps to make ISIS's point for them. It gives the impression, rightly or wrongly, that Europe really is hostile to Muslims.
ISIS's attacks on Europe {or any other nation}, whether by design or not, could thus serve the group by deepening the backlash against refugees.
"Having this wedge driven, where [ISIS] is able to intensify the backlash against refugees might help with recruiting efforts by extremists to recruit among the refugee population," Gartenstein-Ross says.
"Game it out from their perspective," he continues. "If they were able to move operatives into Europe {or any other nation}, posing as migrants and refugees, then that's a major win for them," both as an act of terror and to increase anti-refugee sentiment in Europe {or any other nation}.
{added by blogger for emphasis}