Indeed, this is such a pervasive question for journalists that they have entire courses on "journalistic ethics."

ProPublica even wrote a long statement on why they believe publishing this is ethical, legal, and in the public interest: https://www.propublica.org/article/why-we-are-publishing-the....

You can of course disagree with their reasoning, but Arnold—who claims to be, it is worth noting, a paid PR flack for tech companies—is being disingenuous* to suggest that ProPublica claimed their "sole criteria for publishing" is "truth".

* By which I mean, to be perfectly clear, he's a liar.