Well,
there are many reasons why Anonymity / Privacy should be important to everyone.
Many people will still be thinking that it's a matter a doing illegal things.
But everyone has the right to privacy. Everyone should have the right to protect his "assets".
Being "anonym" does not mean necessary doing illegal things, but you are protecting your privacy from attacks, from spam, from data leak etc, you don't everyone know about your private life, and that does not just apply "online".
It's just like you are walking in the street and someone is asking for your email address to send you some ads. If you are not interested, would you really give your real most valuable Email? Does it mean you are doing anything illegal? Not really.
But Yes, some people will abuse of it, just like some people will abuse of the the anonymity of Bitcoin.
Have a look at this animation
#joke