This isn't "end of story." These ISIS guys aren't just buying tickets to CDG airport. How are they getting into Europe? What's the easiest way to get into Europe if your from Syria? It isn't going through traditional entry routes, it's blending in with refugees.
Why are so many people attempting to vindicate the refugees? If the bad guys are from Syria and 38% of the hundreds of thousands of refugees are Syrian, then wouldn't it follow that some percentage of those refugees could logically be nefarious actors? To think otherwise is to be incredible naive and perhaps blinding by an ideological desire for these refugees to not be part of the problem.
Sure there's tragedy in Syria, however, I'm unwilling to open my home if that exposes my family to any risk. There's no upside for me. There are plenty of poor people here in France that could use my help -- my capacity to care deeply about every single person in every single war zone is limited.
Let's export 50,000 Syrian refugees and dump them in the Mission District in San Fran and see how opinions change.