I stopped being ambivalent when I began running my own mail server and saw the massive quantities of downright garbage trying to come through. I only have aobut 80 users, and since Monday, thanks to miscellaneous RBL's that I use, I've managed to block over 15,000 e-mails. If my users double, the spam will double.
It's not the "watchdogs" that you should worry about, it's those that think their commercial speech qualifies as first amendment protected speech. They get all fired up over their spam runs being blocked, and file lawsuits that may or may not have any merit because no one wants their e-mail. They don't realize that their freedom of speech ends at the edge of my private property.
And another update to this situation...
The judge ruled that e360's motion to the court (to have ICANN yank registration, Tucows yank registration, shut down Spamhaus, charge Spamhaus daily until they were off the RBL, and criminally charge US users of the Spamhaus RBL) was overly broad and dismissed it. There's a few interesting discussions in nan-ae about it.