The reason might seem odd. But it ocurred to me that if you want to use immigration to reduce crime, including rape, the obvious solution is to ban all male immigration.
That shocked me because it seems so wildly discriminatory. Yes, most violent crimes are committed by men. But very few men commit violent crimes. Banning male immigration would punish a large group for the appalling actions of a few. Making it about "$some_country's men" doesn't seem a whole lot better. It's still unjust to punish someone for someone else's crime.
If anyone is curious about the exercise, I recommend trying it. It was disconcerting to sit with the idea of banning male immigration, really seriously consider it and realise how viscerally shocked I was by the idea.
Edit: for context, in the UK right now, phrases like "rape gangs" are part of the debate/argument about immigration.
I don't get this. Is there nothing like some sort of number to register any tax withholding or the like? I imagine that tax authorities and immigration authorities don't actually cooperate together (and for good reason!) but my impression for places like the US is that you really do have to provide some sort of number provided by the government for most kinds of employment.
Unless of course you're just not trying to pay payroll taxes I guess?
The wrinkle is that it doesn't seem to be tied well to identity. Someone working illegally can provide an NI number that's legit but not theirs. Their work accrues to someone else's NI record, but the person getting the extra years probably never notices and the person working under their NI number doesn't care because they aren't entitled to a state pension anyway, they just want to work now.