Because the debate is not about whether or not you have something to hide.
It’s about your right to consent. You should have the right to say no. And you should have the right to change your mind for any reason. You should have the right to regain control of who can store, access or process your data.
Depending on where you live you may have such rights, or you may not. And the political debate is about granting, strengthening, weakening or revoking these rights. And you should care about having these rights, whether you use them or not.