Loud-living-dogma:
causes of poverty are understood to be an aspect of “social sin” rooted in our social and economic structures and institutions
I think this is a statement about economic and social structures that tend to act as ‘feudal system’ of sorts… which in effect keep the poor poor. For example, in poor neighborhoods, in say Chicago, the schools are terrible, the food offered for sale is very poor quality, drug infestation is ignored by enforcement… etc.
Additionally, systems like in the US where immense amounts of wealth are consolidated among very few and the economic structures cause an ever widening gap between the super rich and everyone else. If in these systems the poor have a reasonable chance to get out of those terrible situation and are provided for without intervention by institutions like the Church or government, great… if that is not happening as is so in the US, they structural changes are necessary.
Rerum Novarum speaks eloquently about the need for the economic and social structures to work for everyone. The Church has a duty to weigh in on this subject