Just think about it for a minute...
wet wipes are packed in what?
Water and soap, right?
Since they do not break down in the container while they are soaking in whatever solution is in there with them, how could anybody think that they will break down when flushed into a holding tank, septic tank, or sewer treatment plant?
Our motorhome had been sitting on the sales lot for about 6 months before we bought it. The first thing I did when I got it home was flush the black tank. I got a half dozen or so wet wipes or baby wipes out of there, and they looked like they were brand new!
The only place used ones go around this house is in the garbage. I won't even drop them into a vault toilet at a Forest Service campground!