(1) Information is provided that appears to be evidence that someone has committed a crime or otherwise acted inappropriately in ways that are very significant. It may also provide evidence that exposes systematic corruption.
(2) But the information was provided by a source that is disreputable and possibly even hostile.
(3) Therefore the information should be ignored.
Some might say that the information itself and who is providing it are two separate issues. If you take the present actors out of the situation and look at it as a question of ethical norms, it does appear that a case could be made for either side and that there might actually be cases where you might agree with (3) for the good of the country. I think it poses an interesting ethical dilemma and not one easily resolved for or against (3).
In the case of the present election, I think it turns out that the further a Trump presidency fades from reality, the more it begins to look as if the Russians have actually done us a service by exposing possible corruption. It will hopefully make our political processes less suspect by exposing corruption where it exists and make us into less of a country where elites who are able to manipulate the system are able to get the upper hand. If there is a flaw it really is that Trump’s side is the side presenting the information and for that reason it will likely be ignored for partisan reasons. But it will be interesting to see what happens after the election.