Lots of technology doesn't work, but we're still going to use it. Sometimes because it's better than nothing. Sometimes because no one gets fired for using <insert standard technology here>. And sometimes just because the politicians owe favors to their corporate handlers.

Lie detectors, Sea Wolf submarines, facial recognition software, etc etc etc. Many security technologies lie on the spectrum from "impractical" to out and out "doesn't work". But we just have to get comfortable with them, because they aren't going away.