Get a grip
This is not an 'invasion of privacy'. This is just simply saving time; if they need to fingerprint you they can take you to the station (4 hours) or do it on the street (10 mins). Your 'choice' is irrelevant
As to the person who has never been finger printed and thinks the police are going to stop him just to add him to their database ... your more likely to be stopped because of all the crack your smoking.