Today a Russian civil airliner came down over the Sinai peninsula. All 224 on board of the Airbus A-320 were killed. The Islamic State in Sinai claims to have "brought down" the plane.
That is unlikely. According to flight radar data the plane was flying at 30,000 feet when whatever happened occurred. IS in Sinai has anti-air weapons but those reach no higher than 10,000 feet. It is in principle possible that IS infiltrated the airport at the Egyptian tourist resort Sharm el-Sheikh where the plane was was coming from and smuggled someone on board. But it is unlikely. The usual travel arrangements for Sharm el-Sheikh are group travels where anyone not belonging to a group would be suspicious. Security at Sharm el-Sheikh is usually tight. There is also a report that preliminary investigations point to a technical failure.
But IS claimed responsibility and the fact that it did can be used. How about a salvo of cruise missile on "IS targets" in Syria and Iraq? No one could really complain now if some of those cruise missiles hit IS … or something else …
But whatever. That IS claims to have taken down an airliner shows that it has intent to do such. That is then the end of stupid arguments to work with IS or to let it live and prosper. The claim will also the end to any attempt to give serious air defense weapons to "insurgents" in Syria. The weapons could easily end up in al-Qaeda or IS hands and it is now clear what they would be doing with them.