If they could read your retina signature while boarding with a camera and the process totally non intrusive caused zero delay would you be against that also?
I’m 100% against ANY system that treats ALL people like criminals for the sake of maybe (but probably not) catching a couple of criminals. That system is no different than IDing for sudafed, it’s assuming I’m a criminal and gathering evidence for the sole purpose of prosecuting me later if they decide I crossed some imaginary line. Free societies have risk, man up.