I don't know where you live, but even though yes, such a right exists, it doesn't mean you shouldn't fear the government or its actions.
US is extremely bad about this, but most western countries have this problem - let's say that you get accused of something(unfairly). In most western countries(with some exceptions) media can immediately print "_ZeD_ has been arrested on suspicion of murder!". You are usually arrested and kept until trial if the accusation is strong enough. In the meantime, you lose your job. You lose your friends and family support, except for the select few who actually believe your innocence. Your neighbours immediately know they live next to a murderer(even though nothing has been proven yet). And yes, in some countries(US....) you can be waiting a year for trial. Then, the trial is meant to be "fair", but surprise, it's a jury trial - the very opposite of fair, it's basically 12 random people deciding whether you should go to prison or not. 12 people who have spent the last year watching the news explaining how guilty you are and how the local police department is certain they "have the right guy". But sure, you got your "fair trial".
But let's say you win. You are cleared of all charges, and are free to go. The government will not automatically reimburse you for the time you spent in jail(or some very nominal amount), your old employer is not required to give you your job back, and there will forever be people around you who secretly think you are actually guilty and just managed to escape justice.
Or, you could just not trust the government and never ever put yourself in a situation which increases any chances of being accused of anything, fairly or not. The government has infinite amount of money and time to make your life miserable if someone is dedicated enough. They can make your life absolute hell or basically put you in a never ending loop of trials, which even if you keep winning, they can just bring more on, while your life is ruined.
A private corporation can also make your life hell, but the only difference here is that at the very least, they would have to have a financial reason to do so. The government doesn't need that reason, all you need is one career prosecutor who thinks they can get a nice reputation by making an example of you.
And the funny thing is, I generally trust our justice system(here in UK at least). I trust the police, I trust the court system. And yet I would never ever willingly give the government any information that is not absolutely 100% required by law for some essential function. Nuh uh. Nope.