The funny thing is that everybody has something to hide. There are nuances, but nobody is a completely open book. Most people want privacy when they go to the restroom, when they're trimming their nose hair, when they impulse buy 3 bags of Doritos at 2am after a bad breakup, when they projectile vomited after too much drinking on a girls night out. I'm guessing most people wouldn't want their boss to see any of that, or their mom, or random internet strangers. And none of those things are illegal. 

Everybody has something to hide.