Their editorial teams are independent. Yes they're right leaning, but you can't expect the left wing to report on its own these days. As for the laptop contents, they've been leaked on the internet already.

And yes they do run stories when they can't vet it. They lost a settlement with Nick Sandmann over it: https://www.cnn.com/2020/07/24/media/washington-post-sandman...

They don't have to physically hold every piece of evidence and forensically investigate it in order to report a story. No one did that with the Snowden story that Glennwald broke. That's ridiculous. You simply frame it as "Documents Reportedly Show Biden Family Involved with Chinese Business Deals" or "Questions Surround Biden Family Foreign Business".