In other words, We just don't care about users that unsubscribe (and why would you, really, you only care about profit) so we (unintentionally, maybe) engineered our systems so that unsubscribing is one of absolute lowest priorities.
Not solving nonproblems is how reasonable people operate.
If Amazon started sending me a ton of useless random packages every week, you bet that I'd expect them to have a team of ninjas chase the driver down and forcibly remove my package.
Spam and marketing mail should be - needs to be - opt-in and illegal.
I would love to have an ACL on my physical mailbox, where all senders I have not explicitly authorized get mail returned to sender at their own cost.