Since I was involved in the editing, I will respond. The reason I edited is that a number of people evidently found the title or the post 'offensive'. I did not feel that way myself, and had at first declined some flags to this effect, but in the end I came around and decided that if enough of the community feel this way, that should probably trump my own opinion, and thus I made a strike through the offending word 'scum' and changed the title, thinking or hoping that would be the end of it.
Or, at least that was my read: that it was the word 'scum' in the title that was deemed offensive. Perhaps I was wrong about that or we need to get clear on that (just flagging something offensive is not necessarily informative) -- it's true that the word sometimes carries nasty connotations that we don't want to promote on this site, even though I didn't think those connotations were evoked here. If both 'scum' and 'slum' are equally offensive to those who flagged, then the present situation is no improvement and is in fact worse than before for reasons given by quid.
But at this point I do sort of feel a mountain is being made of a molehill: the question is just not that important (I'd be surprised if the OP disagreed) and has warranted much more attention than it deserves. I also think it is clear enough what happened. Quid's suggestion at the end of his answer would be fine to me personally if the word 'scum' itself is not the problem, but I plan to make no more edits myself. (Not even sure why the Masked Avenger thought I should be the one to do an edit in the first place, but I did so in an attempt to keep peace. Maybe it was a fail, as the kids today say.)
I refuse to delete the question: it was asked in good faith, and deleting would subtract reputation which I think would be completely unfair.