Glenn Greenwald believed in the story, and was later proven right. I don't blame other media outlets for waiting for additional confirmation, but I do blame Twitter for inventing a totally new policy for censoring this one story. In a case like this, where some journalists believe in a story and others don't, but neither side has won the debate (yet), the story should be published and discussed. That's the policy they take with literally every other news story, including many dubious ones that are later discredited.

I guess I can't prove this part, but I'm pretty sure Twitter would have taken the opposite stance if, say, CNN had found Trump Jr's laptop.

Regarding your claim that the story is not a big deal, you as a voter are entitled to decide that for yourself. However, a majority of likely voters disagree with you. A Rasmussen poll found that 48% of likely voters consider the story "very important" and another 18% consider it "important."[1] Rasmussen is considered a grade-B pollster by FiveThirtyEight, so their data can be trusted.

[1] https://www.rasmussenreports.com/public_content/politics/gen...