I feel people are misunderstanding Aesir here.....
Yes, the situation is not ideal, and faeries and......
But.... his ..sentiments are with humans, and honestly... the only way to resolve the current situation would be to engage in an act of pure genocide. By sinking/quick-dunking the entire island. And yes, he can......
The fruit will aid the fairies to an extent, but they'll either die out or find a way to co-exist with his favourite race, the humans. Something which isn't happening elsewhere.
This is a very subtle hint that he can afford to check up on this after a century or two to see how things are ...developing...
And nuke the place if it didn't work out...