There is a lot of truth in this but also a huge warning. The Old Testament prophets spoke out in times of great prosperity. They didn't simply rest on the idea of "cheer up, chaps." Most of the folks were not widows or orphans, nor were most of them needy. And yet the call for economic justice was urgent.

Capitalism is a wondrous thing on the one hand. On the other hand, capitalism seems far more popular than Christ. The danger of that outlook is that at a point someday where perhaps 90-95% prosper, society may simply write off that remaining 5-10%, either through neglect or euthanasia.

Because Christians in general are not financially generous toward their churches, the lion's share goes towards buildings and salaries and only a small fraction of church giving (with exceptions here and there) impacts economic justice.

There is nothing wrong with pointing out these shortcomings of capitalism or freedom, but I do not accept that it is unjust that capitalism allows some poverty to continue, or that what people mean by "economic justice" is a form of justice at all.