What happens when you refuse to answer a passport control officer's questions
Contrarian viewpoint - you're dealing with humans with emotions, and they deserve some respect on that human level. If you want to take a moral stand against encroachment of civil liberties, I respect that. But why not be polite? "I apologize, sir, but I'm morally opposed to answering questions beyond what I have to. I'll comply with the legal requirements to enter the country, but I don't answer questions I'm not legally required to on principal - I think it's no good."You're much less likely to have trouble that way, and it explains why you're doing what you're doing, which makes it more likely to have a positive impact and get the officers to re-think why they're doing their job and what it means. Stonewalling them is your legal right, fine, but it seems to be a sub-optimal choice on a principals/ethics level and on a practical level. Now before anyone replies, "You shouldn't have to bow and scrape to get into your own country" - yes I agree with you, but being rude doesn't accomplish anything additional than stating your principals politely.