There might be cases where a criminal would want to call 911 on a victim (possibly collateral damage of their crime).
Not saying this happens, but the only way it could happen is if the guy calling has some guarantee of not being identified.
I'd much prefer having a criminal get away and saving a life thanks to the 911 call than him getting away and letting someone die because he had no way to call 911 anonymously without disclosing his device's location.
I think that hypothetical is rare enough of an event that the overwhelming likelihood is more people turn it off without knowing the implications and then are unable to share their location when they are in an emergency.
Not saying this happens, but the only way it could happen is if the guy calling has some guarantee of not being identified.
I'd much prefer having a criminal get away and saving a life thanks to the 911 call than him getting away and letting someone die because he had no way to call 911 anonymously without disclosing his device's location.