Our country was built on immigration years ago when we weren't so populated. WE are a country of 320,000,000 people and counting. Resources and money are NOT infinite. I don't really care what you do in Australia, TBH. It has absolutely nothing to do with me. I AM concerned what happens in MY country though. I don't want to take in these refugees. IT is too risky and just ONE American life lost to them would be ONE too many.
I read in the Guinness Book of Records that if every human being on the planet had one square meter we'd all fit into the island of Skye off the coast of Scotland. Somebody once said to me the same but used Texas as the example. I don't know which example is true (I'm betting it's the GBoR, but the Isle of Skye is minute compared to Texas, so the Texas example sounds more reasonable). Go get a map of the world, spread it out and look at Texas. Then tell me you don't have more room.
India has huge masses of space and is one third the size of the US, yet has four times the population. You have 35 people per square kilometre - that is 180th in the world - in other words 179 of the 220+ countries in the world have denser populations than you. You have plenty of room.
One American life lost in any circumstances is one too many. What about the millions and millions of immigrants over the past few centuries who haven't taken any Americans lives? Why should they be punished. Your view is very short-sighted...