Well the one big problem with that is that poison is not, in fact, man made. Most poisons in the world are either directly from plant life or derived from a naturally occurring organism. In addition, how much pollution is from Oil? (a naturally occuring substance form the decaying remains of prehistoric animals and plants) and from radiation? (radioactive isotopes are also naturally occuring elements, for the most part) and furthermore to whoever said the typing should be "fairly evident to those with a minimally decent level of education and world knowledge" you REALLY need to google Fairies and the actual origin of them because you are not, ironically, educated on them at all. They are most certainly not the crusader's for nature and pretty things like Disney or modern culture protrays them as, they are evil little monsters that do horrible things, historically. If you don't want to do the atual research yourself, then the movie "Don't Be Afraid Of The Dark" is a much better representation of the historically accurate myth of the fairies (Monsters that steal children and eat their bones) than Tinkerbell. (although like any movie, stuff is changed from the mythology to fit in better with the movie)
I am well aware of that. And in lots of European folklore, iron was a good way to ward them off- hence the Steel weakness.
But not all fae creatures were the evil bastards that you describe- many simply having a fondness for mischief. And some did indeed do good, if they ever felt like it.
Buncha mini-Deadpools, pretty much.
And you ignore that the games are made by the Japanese, who- while not having any direct equivalent for western fairies- could easily have just mixed and matched the Disney interpretations (and most likely did) during the creative process.
As for the pollutants- while there are naturally occurring substances- a large amount of them are exacerbated by our use of them i.e. made much worse after we've run them through our machines and whatnot. Uranium doesn't do much harm until after it's been refined and used up for nuclear reactors, for example.