For a rather wider discussion of the issues involved in photographing protests and showing the faces of those taking part, you may like to read On Ethics, The First Amendment, and Photographing Protestors’ Faces by Allen Murabayashi.
It is of course in some respects a very US-centric article, talking about Trump and about the constitution. But I think it makes some of the reasons for the disagreements over the issue clear, and is worth reading.
Murabayashi gives his own opinion in two short paragraphs as the end of the piece:
To me, the real discussion shouldn’t be about the blurring or obscuring of faces, nor gaining consent of a subject. These are tactical choices, and in the U.S. there is simply no expectation of privacy in a public setting.
Instead, we ought to continue to consider how photography is used to portray others (particularly the vulnerable), and whether an image truly advances a story or simply acts as a signifier for the photo we should have taken.
Op cit
The link in the last sentence is to another piece by Murabayashi, The Photographic Phases of Depicting COVID-19, which is also an interesting read.