I think people in authority definitely could have been a bit more involved in saying 'OK, protest, but please wear masks,' and maybe there should have been more of that from the media as well? But to be honest, I think people who blame this on 'media bias' are a bit off base. Sturgis is only a story because of coronavirus and the implications of their gathering, as well as the fact that they seem to be pretty blatant about not giving a fuck (also I don't know that they've received undo media coverage, this thread is the first I'm even hearing about it), but with the protests, the police violence/shootings and the protests themselves are the story. They're actually one of the only things to really break through the constant corona-centric news cycle since this whole thing started, and from a media perspective covering the protests themselves makes more sense than just looking at how it might affect corona.
Also I seem to remember a decent number of protestors were wearing masks? I think some of them were doing it pretty shittily though, like off the nose, so it probably didn't matter that much anyway.