In NSW Random Breath Testing has been in force since the early 80's - with no real community outcry. The general limit is 0.05 but goes down to nil for inexperienced drivers: as it is a quantifiable measure of blood acohol no questions re weight etc come into this. SOme people do "seem" to drive better after a few, but pray like hell that nothing out of the ordinary happens.
I prefer RBT to continue rather than have the continuation of the alcohol fuelled carnage that was prevalent before - it enforced resonsible behaviour on all drivers and has (I believe) altered community behaviour. Yes, you do get the criminals who drive while disqualified, but they are soon picked up.
IMHO please find some other bandwagon when it comes to civil liberties - I do not wish to be killed or seriously injured by a criminal (which is what we regard drunk drivers as) simply by venturing onto the road as a driver, passenger or pedestrian.