> It's like splitting bills with your unemployed brother in law.

I don't think that's a great comparison. It's not just a choice for now, but a multi-generation plan. If we don't share now, we're just going to end up with the possibility of poorer countries getting into more extreme governments as requested by suffering population and eventually waves of refugees.

It's more of a choice of supporting a neighbour in development with the prospect of better trade in the future, or saying "not my problem, let my grandchild deal with the fallout".