Well, they're downplaying it because they don't believe it and neither do you, they say. Again -- it's about eroding trust in institutions that become susceptible towards disinformation because they've contorted themselves against a pro-Western reality where there is ample evidence that the Russians did hack the DNC/Podesta/etc.
Look, I think that reporters should report on the leaks. Someone leaked Trump's taxes. But I also think that, with the taxes, they went out of their way to see if they were legitimate before they published them. That standard should probably apply here.
I'm also annoyed with the idea that we are allowed to peer into a campaign's personal emails in the name of journalism, but we can't know who is providing WikiLeaks with their material. Seems like a double standard.