Michigan: No idea about that, that WAS news to me. But the article is about "Why don't we eat swans" and the Michigan part is really a bad example. So ... it's a pest? No hunting season though? And no explanation?
Frankly, I like swans. I regularly met and fed a couple of swans in Cologne in Germany here, checking on the young ones if the season was right.
I'd love to eat them though.
The article, for me at least, fails to deliver at least a hint of an answer to the question it proposed. That's just a bad format for me. If your main subject is a question, you need to at least try to answer it (and "yeah, they might be cute" isn't it).