There are two grievous flaws in the ignorant and idiotic statement "if you have nothing to hide, you have nothing to fear."

Firstly, it is not for YOU to decide what you do or do not have to hide --- that decision, rightly or wrongly (and it is mostly the latter) is in the hands of those in power, i.e. the government and their agents.  And more and more, they are deciding that you, we, DO have something to hide.

Secondly, effectively EVERYONE has something to hide, whether they realize it or not, due to the vast and ever-growing web of onerous and intrusive laws and regulations, particularly on the federal level.  It has been estimated that the average person breaks the law at least five times every day.  So anyone who dares to publicly speak out or resist those (unjust) laws will surely invite those in power to scrutinize their life and their past activities in order to find something with which to prosecute that person, particularly in this day of the death of privacy.