But what if for the last hundred years or so they have been breeding indiscriminately, killing and eating all their native animals and fish, polluting their eco-system by using petroleum products en-mass, making large numbers of concrete buildings and seem to have no real awareness of global warming/climate change and only now are being made aware of the problem and now they are on their way over here to stuff up our "carefully looked after land" by their uncaring presence as they flee their population induced catastrophe.
It's not the least charm of a theory that it is refutable. The hundred-times-refuted theory of "free will" owes its persistence to this charm alone; some one is always appearing who feels himself strong enough to refute it - Friedrich Nietzsche