Honestly, people shouldn't click the unsubscribe links anyway. Spammers use that as a way to make sure people are actually reading their emails.
This is true for newsletters you never subscribed to in the first place. But unsubscribing from mailing lists you once subscribed to should be possible (and done) through the unsubscribe link. There are a lot of valid reasons (change of interest, frequency of mailings ...) and I agree with the parent that unsubscribe links should work immediately and not try to discourage you from unsubscribing.
Speaking of ranty complaints, why does the linked page auto-scroll to the top when you click on it? That's lame and annoying.