And you're a fool if you think that the fact that there exists no "total anonymity" (pretty much like there exists no uncrackable encryption) is an argument against striving for a feasible level of protection of anonymity rights.

It's not a question whether you can stay anonymous. It's a question of whether you should be allowed to - which you should.

I believe one can achieve quite strong anonymity given sufficient effort. The effort is probably more trouble than most people are willing to make in most circumstances. Often people want precisely to engage in social activities on line with their primary identities visible.

A lot of smart people have put a lot of effort behind projects like Tor and Torbutton. https://www.torproject.org/torbutton/ Having some expectation that they can be effective when used properly does not make one a fool.

At least you can remain anonymous to advertisers in as many contexts as possible, and make the others work for it a bit. No reason to make it easy on anyone.