You are correct. It comes with a warning that says it is not for utility purposes. So SD only.
But it also comes with a brochure that states by virtue of its design, it is not a killing knife, and in fact it would be difficult to kill with.
I know something about knife fighting/ defense, and a stabbing knife, no, it isn't. But as far as slashing, this knife will reach out and grab. And as I said, it has the size to reach all the important cables.
As it bears on this discussion, I can only surmise that Spyderco feels that since the Civilian doesn't stab, that the ability to do so is what makes a knife lethal. If that's the case, serrations or not aren't a factor for a self defense knife as much as a sturdy point.
As far as every day tasks go, sharpening serrated edges has always been a pain to me. A couple of companies make unique serrations that can be sharpened on a regular stone with no special technique. I'd go with one of those.