If they mean by “citezen” an immigrant that became a legal ciizen through proper channels, all I can say is the crieria for citezenship in many westernized nations (Including ours)is sevelry lacking in integrity and common sense.
It seems that increasingly that at least half of these nut jobs have European citizenship. I suppose it acts as a kind of insurance policy if things heat up whateverstan they’re from, as well as being able to get on the dole.