[meowface]

>(Unless that's just to deviously throw us off their trail.)

This seems fairly probable.

But, yes, those are all valid points. The Mueller report does not contain the actual hard evidence of the attribution. It contains the full names of the people who registered the account and a lot of the things they did, but it doesn't state the proof of this. I suspect if we all had Top Secret clearances we would probably all be satisfied with the evidence they have, but that's blind speculation of course. A large percentage of it may be Dutch intelligence's findings, which have been widely reported on, but of course you still have to take Dutch intelligence's word for it that they really did compromise GRU computers and observe them.

There is some real evidence (especially released by private security firms) of GRU and SVR hacking the DNC et al., and Guccifer 2.0 is the only one who ever claimed to have the documents discovered during the hack. There's probably a lot of other circumstantial evidence, too. If I get around to writing a long post about all of this, I'll cover everything I can find.