My source for this is an elective class I took at Oregon State University a few years ago, taught by a professor who is deeply involved in fishery research and management. So perhaps he was biased, but from what he presented I was thoroughly impressed with the sustainability practices of the seafood industry. One of my big takeaways was that wild Alaskan halibut in particular (which is what McDonald’s uses) is among the best seafoods, and one of the most sustainable foods in existence.
[0]: https://en.wikipedia.org/wiki/Cypress_Island_Atlantic_salmon...
Those are very good points that I neglected to mention, and my professor spent a lot of time discussing them. One of the main points of the class is that seafood sustainability is extremely dependent on the species of fish and the country of origin, and so it’s important to do research on where your fish is coming from. I don’t remember a lot of details anymore, but I do specifically remember that most stuff from Alaska is excellent, and shrimp is awful in terms of ethics & sustainability.
Living is all about understanding trade offs and making informed decisions. Just because plants don't scream when you kill them doesn't mean a plant-only diet is without negative effects as well.
And a fourth option, it seems. However dark.