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I also have nothing to hide, but that doesn't mean that I don't mind being tracked or that I don't care about privacy.
It's a big misconception that privacy is only needed by criminals or other people who have something to hide.
For example, I happen to be a political activist and a trade-unionist. I have nothing to hide, in fact the opposite is true: I want to spread my opinions as widely as possible. But I am quite worried about how malevolent governments or organizations could use 1984-style methods to attack me or (more realistically) my friends in other countries like Russia, Kazakhstan, China, Colombia, Brazil, Nigeria, and so on. I can tell you a couple of stories of how people who I consider to be my political or trade-unionist friends in those countries get intimidated, imprisoned, physically attacked or even murdered by regimes or by paramilitary groups unofficially supported by governments or big companies. In those countries it is not safe to express your political opinions. You and/or your family can be seriously at risk if you dare to organize a political opposition against some regimes.
In my country (Belgium), at least at the moment, it is safe to express opinions - at least you're not risking your life or health. But I can't trust my government and companies (like ISPs) to not keep track of everything I do, and to not collaborate with other, less "friendly", governments and companies by providing them the information they collected. So it still is a problem for me, even if I am not myself in any actual danger. For example, I could very well imagine that the USA would like to support some right-wing political party in some third world country, and one way for them to do that, is by helping them to eliminate left-wing activists (which could be my friends), which they could do by getting those left-wing activists tagged as "terrorists" by whatever corrupt government is in power over there at the moment, so they can then use whatever advanced data mining methods they have to use a.o. my personal data (handed over to the USA by the Belgian government) to help identify and locate my friends in those countries, so they can get them killed or intimidated or whatever.
This scenario may sound far-fetched but I can assure you that in some countries this kind of stuff is a daily reality for political activists and trade-unionists.