pjmlp stated "All forms of software development are fine, as long as the developers manage to have some form of sustained earnings from it, which is not so easy as many think." .. in which, in context, he likely meant that those who are inclined to look askance at closed-source companies should realize that there is much sustained value to be derived from such activities. Our community tends to frown on people who advocate the Jim Gray[1] closed-source perspective, so pjmlp was naturally inclined to be defensive.
icebraining was simply taking issue with the portion that reads "All forms of software development are fine, as long as the developers manage to have some form of sustained earnings from it" which, if taken literally, suggests that extreme cases like software that kills kittens is morally good as long as someone makes a buck from it. I am pretty sure that pjmlp did not mean it in exactly this way.
[1] http://www.infoworld.com/t/platforms/microsoft-exec-open-sou...