On the flip side, you have the "good guy problem" that we normal "good" people will happily give up our rights in order to help catch bad guys.
But really... it's not a MAC address or an IP address. It's your face. What "defense" is there to facial recognition software? Even if you stay off of facebook, your friends and family will still post photos of you there and reference you and talk about you. "No man is an island" has never been more apparent.