And even if that would be a reasonable argument it would still be an argument for stopping more migration because otherwise you continue to have new first generations.

As someone who happens to be a descendant of one of the very rare pre-1965 immigrants from the subcontinent, I assure you I am not writing this from the inside of a jail cell.

> it is not said honestly out loud, because it is absolutely insane, and would be rightfully rejected

I don't think not saying it out loud is helping the current policy makers; the right and the far right understood right away this was their biggest point. By not engaging them in the discussion , or engaging with hand wavy trickery, you kinda lose the debate I think.