I'm not saying they shouldn't fact check - rather, if they aren't sure about a leak, it's irresponsible of them to talk about it before they're sure! Same goes for security - if delaying a leak helps security, surely it helps even more if you don't speak about it at all until ready to release.

Furthermore, announcing leaks gives the orgs being leaked on time to get their story straight and destroy evidence, so I'm really skeptical that announcing leaks like that is the responsible course of action.