This (complaining about the lack of evidence) just seems ludicrous to me. Does the FBI have a history of declassifying stuff like this so that randos on the internet can independently verify its conclusions? When high-level intelligence people collude to lie to the American people and discredit a president, do they usually do it via press release clearly written by a PIO?

The accusation that people who find this credible are uncritical is unfounded and insulting. The question is not "would someone in a government agency lie for political reasons," it is "would this many people, in a bunch of different agencies that have a history of lying to and competing with and distrusting each other, all sign on to the same lie, publicly, even though it's almost certain to be disproven in a few months."

Meanwhile, here's the alternative theory:

1. Some Russian intelligence agency hacked the DNC's email servers

2. They left behind evidence

3. The FBI/NSA//DHS/etc found that evidence

4. They classified it and aren't going to put it in a press release

None of those are the least bit hard to believe, and they are collectively WAY easier to swallow than this hypothetical vast, high-level conspiracy to discredit Trump or whatever it's supposed to be for.