That's a cop brain argument. Just because you're out "in public" does not give anyone permission to freely do with your personal information, such as images of you, however they so please. Utter horseshit. Your right to privacy in your affairs travels with you, and having a major political official post images of you which people may use to figuratively and literally attack you for political reasons without due process is about as major a violation as I can imagine, ignoring any other factors or details around that release.
You can make an argument that, this being an honest-to-god protest, maybe these people were conducting them in a fully-public way. I'd maybe buy that. But the burden needs to be pretty damn high on that, and so it's not a stupid little fucker like Mike Johnson's authority to make that decision.
Just because (US) law says that it is OK doesn't mean it is OK. Rights have supremacy over law and when the law stands in the way of rights, the law must change, not the rights. I'll remind you that in other places (e.g., Germany), this "out in public" distinction essentially does not exist.
Removing your rights requires due process, period. The (theoretically) proper agencies to follow that due process have the unredacted footage and so they can go through the procedures to release it justly if they feel it is necessary. Mike Johnson does not get to act as the judge, jury, and executioner in a case like this, no matter how much I expect anyone harmed by that act would be human shit.
We'll have no privacy rights at all in the near future if people keep uncritically accepting the arguments the cops make for when and where privacy exists.