Iphone 5s conspirancy theory?

Hi
So i've heard about the conspirancy theory about the fingerprint scanner for iphone 5s
Its a possibility but of course still questionable
So my question is
Lets say this theory is correct, what are the benefits if the government has fingerprints of people all around the world?

Catch criminals.stop theft from bank accounts.

If the government wants to track you, then you have far bigger issues then a fingerprint.