A thief flags you down, grabs your phone and makes you unlock it using your thumb.
A cop opens the cop car door, grabs your hand and unlocks your phone, or even easier, face unlock.
Granted, guns and torture are rather effective as well, but is anyone entirely against fingerprint unlocking?
While I’d want to turn off biometrics if I thought I was in a risky situation:
So they could force me to unlock it, but probably wouldn’t take the time to hunt down all the places there’s secondary authentication. So damage would be partly mitigated