The suggestion that Snowden, in revealing the illegal practises of the US Government is somehow responsible for ISIS carrying out the Paris attack is patently ludicrous.
But perhaps those making the accusations are trying to deflect their own responsibility? ISIS were established, at least originally, by Sunni Muslims from Iraq who had been alienated and excluded from the political process in Iraq. Without the Iraqi invasion ISIS would not exist. Didn't stop there either. In the attempt to supply the Syrian Free Army, which was in fact a number of groups including those who would become ISIS, with weapons and aid the Americans had not only given them fertile ground to harvest, but given them the tractors and machines to till the soil.
And now the Americans complain that Putin is fighting the enemy of Assad; which is ISIS. ISIS for their part took the opportunity to take poorly defended US military equipment in Northern Iraq. Those fighting ISIS in Northern Iraq, the Kurds, have been given little support, and continue to be attacked by US ally Turkey. So how, given the facts on the ground, can the US in all seriousness try to condemn others for assisting ISIS, when without the US they would not exist?
I am not saying the US has made ISIS do what they have. The reprehensible attacks across the world are the behaviours of morally vapid thugs who are totally responsible for their actions. Make no mistake that I have no sympathy for them. But the US cannot wash its hands of the part it has played, once again, in enabling this kind of tyrannical villainy.