42% of young Muslims in France believe suicide bombings are justified (35% overall).
http://www.pewresearch.org/files/old-assets/pdf/muslim-ameri...
Pretty much all the world powers have vested interests in Syria. Russia has started to intervene in Syria very recently. NATO is there from the beginning. There is Iran, Turkey, Saudis, Israel, you name it.
There was supposed to be a G20 event tomorrow (will probably get postponed) and the hot topic was supposed to be Syria. What happened a few hours ago is just diplomacy played with blood.
To quote from the page: 'In videos released during the course of the Syrian Civil War, Free Syrian Army, Al-Nusra Front, other rebel and Islamist groups and ISIL are heard shouting "Takbir" and "Allahu Akbar"'
Some of those are Islamist groups, some are not.
Also, we don't know if the perpetrators were French or not, so what 42% of young French Muslims believe is not relevant at this point. Even if it was relevant, it would be hard to draw any conclusions from it. In the same link you provide, it seems that over 75% of French Muslims are concerned about the rise of Islamic Extremism.
What's your reference here? I'd be quite shocked if people "had no problem" with such actions; "felt they were justified" is entirely believable however.