Nothing is fool proof. If easy-to-use facial recognition leads to more people protecting their mobile handset with some sort of access control technology, that's probably a good thing. The process described at the link is actually pretty sophisticated and would probably suffice for 99.99% of mobile device users.
No good work whatever can be perfect, and the demand for perfection is always a sign of a misunderstanding of the ends of art.
—John Ruskin
Substitute "technology" for "art" and it's still true.
