However, if you are a social conformist living an entirely unthreatening life, you really have nothing to hide in the first place. People have had good reasons to hide something for as long as there have been governments. Maybe it's something as simple as enjoying a beer (once an illegal practice), or maybe it's something as heroic as protecting a Jew family from extermination, with a lot of grey areas in between, like marring a person that desperately needs to obtain citizenship or helping a girl get an abortion from a dangerous pregnancy in a state that doesn't allow.
The government is not perfect, so it should have perfect reach. Through out history we have benefited from the inability of governments to enforce the law with absolute efficacy. The US wouldn't even exist today if England had the ability to know everything that was being discussed in their territories. And yes, sometimes social progress needs heroes. People who are upfront about their beliefs in open disobedience. Sometimes we need martyrs. But social progress doesn't actually happen there. It happens at home, at the homes of the low profile individual.
Morality is flexible and nuanced but the law is rigid, short-minded and often manipulated by special interests. Between activism and suppression there is a valley of unenforceability. I'll dare to say that valley was the reason the US flourished while Europe fell into totalitarianism.
You need this environment. Even if none of your current opinions are controversial. Because one day yours, or your childrens' opinion won't won't be welcomed by government.