I think the problem here is one of scope. Your definition of spam is much wider, encompassing the world at large -- some of whom may want said email. My definition of spam is much narrower, I'm concerned only with what I do and do not want.

If I subscribe to a newsletter, that's not spam. If I try to unsubscribe and can do so with one click or with one click and entering my email address, that's not spam. If I try to unsubscribe and am forced to login (which is illegal in the states, need I remind you) or cannot figure out how to unsubscribe, I categorize that as spam. It is not wanted by me.

Even if it is a newsletter, if you don't let me unsubscribe, that's still spam. You don't get to avoid being labeled as spam just because at some point in the distant past I subscribed and now can't unsubscribe.

Call it selfish if you like, but who else is going to look out for my inbox? Certainly not the groups sending the emails, that's for sure.