Online privacy is a delicate matter. It is not needed to have something to hide. Perhaps at some point, we will all have to. I will give you this example:

There are political dissidents in countries run by totalitarian regimes that hold authority higher than individuality. These dissidents can be identified if they falsely thought that the donations they received were totally anonymous and no one could ever trace the money to his name. Where do we draw the line that online privacy and anonymity are not needed because we are law-abiding citizens?
Belarus? China? North Korea perhaps?

A crackdown of certain parts of the dark markets that are disturbing requires tracing addresses? There are easier ways and more efficient.