I was thinking of the Roman legions integrating Germanic tribes into their ranks in the late Roman era which greatly diluted the Roman legions with a more ethically diverse group than in earlier periods. At one point there were more Roman soldiers that had never been to Rome or Italy than there were actual Romans.
To the Romans it was integrating barbarians. To the Germans it was Germanizing an occupying force.
At one point in history, the line between who changed who all depends on who is writing the narrative.
Okay, but I'm not sure I would castigate everyone non-Latin as being an outcast or criminal. If I didn't know better I'd suspect this is Cato the Younger's (or Elder's) alt.
Early Australian settlers, on the other hand... (Love you guys, but that's just facts. Make fun of our weather or something back)
That is literally a revisionist narrative spread by racists arguing for ethnic purity and making up an example to disallow immigration and enable segregationist policies.
And camels. If there's a God, I guess he figured the weirdly human-hostile insects would keep people from disturbing it, and so didn't plan for invasive species.
Yes, it's a massive problem because they flourish in the outback and will decimate the vegetation. If you want to hunt camels that's a great choice of destination. Just watch out for the molestation flies.