He said that "didn't have potential for abuse", I think the situation you gave defines abuse. Tracking everyone to catch one person is not acceptable in my opinion.

Yeah but what about: Some guy you really hate for his speeches hides in the city. Why not go there and suicide him before he goes and tells the people how their lifes can be much better or nonsense like that.

Or related to that: Let's assume you really hate the Jews for, I dont know, existing maybe. Why not track them all down and put them in camps? It's not like they can hide from you you, you know where everyone is all the time after all.

That’s exactly the situation that has the potential for massive abuse. There is a central institution that’s tracking all movements of all people. What’s stopping them from going after inconvenient people or selling information?