I would argue right to privacy until riding enough public transport and hitting enough incidents that make you wish someone was watching.

Some incidents: 1. A man as red as a tomato with anger yelling at the top of his lungs that he was going to kill a woman and following her out the door at Chicago’s blue line. 2. A woman begging with a toddler-aged child that was constantly drowsy / appeared sedated on a line multiple days, and weeks in a row. 3. The slashing of Nia’s throat in the Bay Area BART.

Eventually we stopped riding public transport, even if it was cheaper or more convenient/fun for the kids, because of fear of traumatizing incidents with little ones present. Its possible that the awareness of possibility of being recorded makes people behave better than they normally would. It’s also possible that public safety is better ensured if they know common abusers and somewhat reduce the abuse.