At least in the US geofencing warrants are a thing. https://en.wikipedia.org/wiki/Geofence_warrant
It is prudent to protect oneself against that.
For protests, the physical switch is an attempt to find a technical solution to a societal problem, which rarely works out. You may as well keep your (Android) phone in your pocket (but turned off, though that won't help with iOS' Find My network).
That might be true on planet Ogo, but not on planet Earth.
> "For protests, the physical switch is an attempt to find a technical solution to a societal problem, which rarely works out."
Another utterly absurd statement. Killswitches are, amongst other places and situations, useful on the battlefield (and therefore urban "battlefield", e. g. protests). And turning a practical solution to tactical and operational problems into a discussion about the inapplicability of such solutions to cure the "ills of society" at large is just... bizarre.