Why are people so cruel? Refugees

[Mister Agenda]

I think Australia could do more to help but unfortunately we have a lot of racists here.
It's not like we don't have room.
We're thirty times bigger than England and almost the same size as the US.
Possibly the biggest problem is our small population.
You don't need to add as many foreign people to annihilate the culture.
I think people are scared of us losing our identity.
Mostly the older generation.

You would loose your identity as this is one of the tenements of Islam (to move into a region and out breed the resident population, and take over in a few generations.) This is one of the alternatives Muslims have to Jihad.

Would you please indicate the sura or hadith that states that?