"To most people, citizenship is the one thing you go all in on."

I've not seen that. I know English people who became US citizens in part because they were moving back to the UK, and if they decided to move back to the US then it would be much easier as US citizens.

I know a South African who views his Irish ancestry mostly as a way to get a Irish passport, which makes it much easier to visit Europe.

I know an Australian whose didn't visit the US until an adult, but who is a US citizen because of her mother's citizenship. She's lived in the UK for the last 10+ years.

I know a Romanian who got Swedish citizenship because it was easier to stay in Sweden that way. He didn't want to be forced to move back to Romania. He's then got US citizenship a few years later. (He actually got Swedish citizenship while waiting for the US paperwork to go through.)

Yes, my father got US citizenship as a teenager, and doesn't consider himself Canadian. So I know there are many who "go all in." But to say that most do that goes against my observations.

Canada has a lot of economic emigrants living in the middle east, mostly working for the oil fields. They follow the same pattern of moving to and from the middle east as the people you have a problem with, only they were born in Canada.

And I personally see no problem with stuff like dual-nationality, economic migration, or hedging bets in a dangerous world. For one thing, it encourages trade, and for another, many people do not feel that they owe allegiance to one particular area of land when compared to another.

Also, Canada is built on and encourages immigration. These people have not tried to smuggle themselves in, rather they were encouraged and invited. It is you that really has no clue on this and your suspicion of migrants and denigration of their general motivations does a lot more to damage society than taking the view that it is better to be a bit more relaxed about the desire of many people to wander.

[edit] It also reminds me of the story I read of this guy who was born in South Africa and moved to Canada when he was 17 to avoid getting drafted, without family support and with little money, only stays a few years and also goes to college there, then leaves to go to the US as soon as he can get a scholarship. He is called Elon Musk, you may have heard of him.