That's how you know the current round of propaganda is just that: propaganda. The CIA is smart enough to know that they don't have anything even remotely resembling proof, but somebody has decided to pretend they do for political reasons.
Saying they "know" the Russians were trying to help Trump is roughly as stupid as talking about wiping a server with a cloth.
If you notice....there’s not a shred of evidence that supports their claim....just humble opinion. I suspect if you did ask them under oath...they’d say it came from talks with the French and Germans. So you’d go to them and ask for proof. They’d say it came from the Italians. So you’d go to the Italians, and they’d say they heard this from the Turks. On and on and on.
It’s all fake.
Even if it can be shown the hacking came from Russia, that in no way implicates the Russian government. It could really be some fat Russian on his mom's computer.