I am all about privacy, but I have to agree here. They already have the data. Moreover if you go to the police officer to check your passport at the border he is using the same facial recognition and there is a camera pointed at your face anyway... I respect the wish to opt out of it, but in this context there is not really an alternative, "opting out" is more of a feeling of doing that then actually doing it. The only way to opr out would be to travel by car and ship.