Had the same thing with my kids. Born to me (Canadian). So instant citizenship. But to travel I've got to get their Canadian passports, which requires other docs, including the passport from their other country of citizenship. I asked if I already had that other passport, could she apply for a visa? Nope, she's a Canadian citizen, even if there is no documentation other than a birth certificate with a (naturally born) Canadian parent on it. They had quite a look of enjoyment as they explained I'd have to do double the work for zero benefit.
Or have about those Canadians who work legitimately for foreign embassies? Canada clearly has those [1]. I assume their kids don't have their citizenship retracted.
My guess that this is meant as some sort of punitive action against the parents, but it seems wrong to punish the children. Even assuming the kids knew, as the article pointed out, what's a 16-year old who finds out his parents are foreign spies supposed to do? Call the FBI? I can see children in a totalitarian country reacting that way out of fear or an excess of patriotism, but have we really reached that point here in the West?
> Everyone who is born in Canada is eligible for Canadian citizenship, with one exception: those who are born to employees of foreign governments.