except the UN has yet to explain WHY ageing or shrinking populations NEED to be replaced. Why can’t they just happily shrink, to expand at some future time?
1. EU, Canada, USA, Japan have inadequate birthrates of less than 2.2 in order to assure stable labor tax base.
2. Pension, healthcare, food & housing entitlements for retirees need to be adequately funded by sufficent number of workers.
Otherwise socialist model suffers financial - societal collapse.
Hence the need to implement replacement population migration.