This article is wonderfully written. However I feel it makes a conceptual conflation.

First it describes the Greek philosophies as being essentially self help. Following that logic it would seem stocisim is not a system of ethics at all, but rather a way of dealing with struggle. Given that characterization, it seems quite bizzare to complain that stocisim provides no moral impetus to help others (a bit like complaining that a hammer - as opposed to a shovel - is a poor tool to dig holes).