A hah Mill twisted Smith's word. Or did not elaborate enough on what that "intrest" in "self-interest". I think"interest" here is not merely monetary only. It can be for faith, spreading the gospel as such. Individual can still be perfectly ethical while pursuing this many facet of "interest" not exclusive to economic gain
For example the anime Spice and Wolf. Look at the moment that Lawrence forgoes his ambition to protect Holo. Not so homo economicus Mill, he gain what form of economic gain huh? Don't make me confuse "self-interest" equal selfish Mill, baka