I'm surprised, or maybe not, with the heavy handed and dismissive way that self appointed road warriors dismiss the comments of other fliers. (Few people here will have flown as much as I have, though they certainly blog a lot more than I.)
If its ok with you that SQ mantains that practice, fine, though I think it odd anyone would defend it on a FF website.
As to the idea that they clearly state they do not award miles, that is not true. They have a chart with x's and checks and if you are not careful you could book without realizing you've been taken. They do not say explicitly NO FREQUENT FLIER POINTS ARE AWARDED FOR THIS.
As to the commentator who says people will fly an airline if the fare drops, I say: "Not true." Personally when I find a company is dishonest, I don't fly them (as a lesiure traveller, I NEVER need to go anywhere at any time.) And by the way, for all the airlines, its obvious that they are offering these fares because their flights are EMPTY, so spending a few dollars to give FF points wouldn't be a bad idea.