Sorry - but you do sound racist.
What you've got to understand - and hopefully accept - is that immigration is a fact of modern life. Even for you Australians, I'd say most (except the aborigines) are emigrants. Yes, you've "acclimatized" but it took you generations to do so.
And to take a "broad paint strokie" as you've done is a disservice to your own ethos as a human being.
OK - did you know that Australia has got the toughest immigration laws in the world?
Even for tourist visas, there is a full body check up requirement?
Including a full rectal exam?
You didn't know...???!!!
Really...???!!
Well, your immigration department wants to make sure that they'd only allow in perfect assholes into the land down-under!!
OUCH.... sorry.... had to write that...don't get mad....!!
SEAJ