Seems to me there are two reasons:
[1] "Russia Did It" explains Hillary's loss in the election. Since every good card-carrying Democrats knows the only elections they ever loose are stolen elections it was decided that the Russian boogeyman makes the perfect foil. They can't really defend themselves since we assume everything Russia says is a lie. And remember, Al Gore still gets standing ovations when he brings up his stolen election. As history shows us, revolutionaries always need a good story to rally around, it doesn't matter one whit whether the story is true or not. In order to fan the flames of the revolution you only need to throw another log on the fire every once in awhile.
[2] The track record of the Obama/Clinton/Kerry years points to globalization as the underpinning motive of their every move. Only by bringing America to its knees and simultaneously elevating its enemies could they advance their globalization agenda.
Syria was merely a pawn in the larger game that included the United Nations, Russia, Iran and China. The evidence is abundantly clear when you tick off all the events that occurred in the 8-year span and stretched all the way from the Ukraine to North Korea. And once you stack up all that evidence all roads lead back to Obama/Clinton/Kerry. "Russia Did It" is merely a subterfuge right out of the Clinton Playbook 101 to distract from the bigger picture.
