Earlier quoted context omitted.
The average person doesn't understand all our nerd worries.
Neither does this specific "nerd". I honestly have yet to be convinced; a lot of it seems very similar to fear mongering and illogical with the arguments being very nebulous. Maybe I have yet to sit down and flesh it out with a deep privacy advocate.
The event was polarising and you had your anti-rioter camp and anti-police camp. It should not be hard to see how there would have been direct chains of command on either side which could facilitate data misuse.
If you want a hard example, look at Hong Kong: protestors getting arrested via all manner of tracking, but also police's family being doxxed by protestors.
Also see Belarus and now Myanmar.
Things are all fine and dandy, until they aren't.
This is why you need checks and balances.