I doubt any criminal really wants to be captured on video. Having just watched a couple of videos this morning of "protesters" viciously kicking their unconscious victims in the head, I'm very much against the idea of anonymizing any of this.
On a somewhat related note, I wonder if the thousands of people being recorded committing various crimes in the US right now realize that their faces are almost certainly being compiled in various government and private databases, to be matched via facial recognition for the rest of their lives. Yeah, not necessarily a good thing, but am I wrong?
I even saw a video where one of them killed a guy while three others watched.