Ideally, with a more equitable sharing of wealth across the globe, free movement to and from all counties would not be an economic issue.
Some countries do not even have 100% free movement, within their own borders, for all of their own population.

Well - the USA does have the Great Fence of the USA along the Mexican border...that's utterly ineffective if not impotent in even minutely affecting a USD 40 billion a year illicit drug trade with Mexico - and that doesn't include the products from other pan and central American countries.

As for Australia - they've got boat people coming at them from all angles. They've got their own welfare island sovereign country that they're supporting - Nauru - where they housed boat people, terrorists, etc.

No small wonder this sparsely populated nation is up in arms over immigration policies.

Aussies, like Americans, are in no position to get haughty with immigrants, unless they are Aboriginals or Native Americans, in which case they have every right to go around killing any white person they see.

Hatred never ends through hatred. By non-hate alone does it end. This is an ancient truth.

If someone builds something, could be new that replaced what was there before, they will want to protect it.
It could be an economy or just assets. Whether or not other parties think they have a right to be there, the assets are owned and understandably will be protected by the owners.
For a government to say, 'OK our ancestors had no right to be hear, so come and take over our houses, our factories, and help yourselves to anything else you want.' Well we all know that is a ridiculous extension of the argument. But that is a natural extension of the argument.
Australia, for example, needs to come to terms with the realities it faces today. It also needs to come to terms with its past, and Australia has done more in this area than most countries. Tying issues together only creates a 'bugger's muddle', that would help no cause.

There needs to be laws/rules that has to be followed otherwise it's all chaos. That's what is happening with immigration. Those that are following the rules waiting in line are being left out while the 'illegals' are given a pass by the current administartion.

as a bunch of immigrants ourselves, its seems we have rather strange views towards immigrants

I am an immigrant in China and I accept the rules. My Mother was an immigrant to UK, and accepted the rules.
I am probably not alone on here, but some of my ancestors were oppressed, some of whom were freedom fighters. Others may even have taken part in oppression, but only as part of the system (military).

If a government decides to make good what their predecessors had done, that is different to my thoughts and actions. I for one do not think that is strange, or incongruous.

What do you mean by 'make good'? Australia had a whites only immigration policy until the mid 70s. THE MID 70s! Its probably the most racist country I have ever been to, and I've been to Japan. And now they won't let autistic people in. Nice.

@Haali
Yeah, it sucks but ruels and polices change and the people have to follow the changes to the rules and laws. Immigration laws are complex and confusing. I wish things would be simple for 'we the people'.