I feel personally affronted that anyone would come into my town and release innocent Magical Creatures in a land to which they are neither native nor properly suited for. It's cruel, inhumane, and actions suited for Middle Age wizardry ...
Have no worries that each and every curupira and sasabonsam will be found and returned to their homeland. However, I do hope that law enforcement finds AND charges whomsoever is doing this to the fullest extent of the law. And if there isn't a law, I'm bloody happy to write one.
What would be just excellent would be if Quidditch teams and fans could just stop. Play your game and have done with it.