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?
For every day use, I use it. It’s convenient.
If I’m traveling or going to a protest, I’ll turn it off. I also make sure I know the ways to disable it.
I’d suggest you may be better off not bringing your phone at all, in this case.