The last time I went rooting around in my SPAM folder, I came back a different person. I am forever changed by what I saw in there. I consider email totally broken in today's environment, but without a SPAM folder it would be closer to totally useless.
With the benefit of hindsight, the invention of SPAM should have told us all we needed to know about the future of the internet. A small percentage of users will do their damnedest to ruin it for everyone else. It's a sign that people cannot be trusted to not use the tech for evil. I'm sure it foretold the corruption of social media as well. It is all SPAM's fault!