If a man is hiding something, it’s because he’s got something to hide.
That is silly. Of course people have things to hide. We all do. Things to hide range from financial information like credit card numbers, Social Security numbers, and the balance in my bank account, all the way to personal or potentially embarrassing information like my sexual preferences, or the fact that I like to watch romantic comedies.
The point is this:
Just because I am hiding something doesn't mean that what I am hiding is illegal, immoral, or any of anyone else's business. That is why the founders felt that this right was important enough that it needed the Third, Fourth, and Fifth Amendment to secure it.