The Washington Post got a number of women to go on the record describing their experiences with him. It wasn't second-hand gossip. Would it have been enough to prove a criminal complaint against him? Almost certainly not (especially since it's not even clear that what he was accused of was a crime).. Did they make a pretty convincing case that the accusations were true? I think so. The women would have had no obvious reason to lie about it, and the Post found relatives and friends who backed up their stories. Also, I would argue the fact that they didn't allege major sexual misconduct probably strengthens their credibility. If you were going to make up a story whole cloth to ruin Moore politically, you'd probably come up with something more salacious than "He kissed me, touched my bra and panties, put my hand on his underwear, and when I asked him to stop he took me home
I know you are trying to defend the media here, but that story actually implicates the media.
Wapo sent a reporter to town for weeks. Asking questions to anybody that there was even a whisper of rumor. They worked their butts off to get a person on record. I am pretty sure I previously posted about this very story. It reminds me of the level of verification they took for validating a photo of Bernie Sanders. Sending reporters to multiple schools to check the official library copy of the school yearbook.
That is how journalism should work.
But that was just one story. And because wapo validated that story, doesn't make it ok to run every story without the same level of verification.
The shopping mall story was an unsubstantiated rumor. It may very well be true. But that isn't how reporting is supposed to work. If you can't substantiate it, you don't run it. You don't run it and admit that you couldn't substantiate it. Admitting that isn't a hall pass.