No, this is not "just" providing a mechanism to enforce that law. They're creating a permanent record of every individual's travels, regardless of whether they

No, this is not "just" providing a mechanism to enforce that law. They're creating a permanent record of every individual's travels, regardless of whether they're wanted for any crimes, and they are storing it indefinitely. If you don't understand why that's a bad thing, and why intelligent people are freaked out about it, I strongly suggest you study history.