[junto]

I think you have missed the point. In poorer areas of the world where life is cheaper than cheap, I'm not going to bother negotiating with you, so that you to come to the ATM with me because I need you to place your finger on the scanner. I'm just going to take my machete and remove your whole hand and leave you to bleed out in the dirt.

Placing any security value on human body parts is a stupid idea, whether as a password or as a automated proof of identity.

[arjie]

I mean that it doesn't matter. If I had a password, you're not suddenly going to leave me alone. You're probably going to extract it from me and then kill me anyway.

I think it's quite clear we shouldn't use biometrics as passwords but I don't think this is a strong argument.