Stuff like this always makes me wonder if the whole multiculturalism thing is a good idea. It's always made me think the country has some massive insecurity issues or something. "Hey, welcome to our country, this is our culture, these are our laws, but if you don't like them, we can change! I mean habeas corpus was always a pain anyway..." A country's laws, rules and regulations should be a take-it-or-leave-it proposition. Culture is far too nebulous to treat the same way, but so long as it doesn't break any laws, or conflict with the nations culture, then it's all well and good. In cases of conflict, the culture of the new country should always take precedent. Just because you did something a certain way in your country is no reason we should do it (or let you) in ours. In fact, if your wonderful country was so messed up that you were compelled to flee, that's a pretty good argument for not doing it your way right there.
As for the whole "Well the Europeans came over here and were all mean and nasty so who are you to complain now?" argument, it is entirely specious. People are complaining about the fact that people are coming to their country, violating the law, and then demanding special treatment, rather than accept the consequences. Now, I'm assuming the First Nations had some sort of "Don't kill us and take our stuff" law, perhaps unwritten, and when white folks showed up and started violating that law, thousands of Europeans died as a result. Unfortunately for the Natives, the Europeans were a lot better at violating their law than they were at dolling out consequences, and so things didn't turn out to well for them. Which sucks. But how much more would it have sucked if after the Europeans showed up and violated the crap out the "Don't kill us and take our stuff" law, they turned around and demanded reparations for all the money they had to spend killing Natives, since war reparations were a part of European culture at the time and all.
Regardless, if you use the logic that, some of your ancestors did something a long time ago, so now you can't complain about others doing the same thing, then nobody alive today should be able to complain about slavery. Or genocide. Or torture. Or spousal abuse. The list goes on...