If someone can force you to use touch id they can probably also force you to enter your password.

(If you’re about to comment about fingerprints on transparency film and balloons filled with warm water then yes good point)

Capable? Yes. Willing? I wouldn't be so sure. You don't even need to hurt someone to manhandle them enough to put their fingerprint on a scanner. Whereas forcing someone to give up a password could rise to the level of torture.

Of course, I imagine the majority of people would yield their password if you simply threatened to detain them long enough to make them miss their flight.

I agree.. having to spend longer than necessary at UK's Manchester Airport would have me singing like a canary!

I think it’s about plausible deniability: you can pretend you’ve forgotten your password, you can’t pretend you’ve forgotten your finger.