Are you saying that 11 bodies (most of whom have gone missing in the last few years) on a 10 mile stretch of highway could happen due to chance alone? If so, let's conclude there's no serial killer at all- and everyone can just pack up and go home. Wait- that's what SCPD has already done.
Manorville and Gilgo Beach aren't the only undeveloped places in LI- particularly the easternmost 60 miles or so. I seriously doubt there are dead prostitutes, 1/per/mile, in each rural area of the majority of suburban communities.
Relax, study old cases, learn, <modsnip>
1.) Even if there are several serial killers in an area, other people also die from other reasons. Such reasons include murders of passion, accidents, all kinds of diseases and simply old age. We had in Manorville that guy who got rid of his ODed friend for example. Because Manorville, you know, rural, remote, fit for a dumping ground.
2.) The existence of a serial killer can be not concluded from the number of bodies alone, but from similar methods of disposal, signature and forensic evidence. So it is clear, there were at least two SKs in the area dropping bodies, since we have two distinct sets of victims, the dismembered ones and the strangles ones wrapped in burlap. I take it, you know that and your little under the belt kick was just a result of adrenaline.
3.) There are more undeveloped areas, true. But there are only a few without traffic cams, surveillance cams and all of that. Additionally, most psychopathic SKs (and note, not all SKs are psychopathic, so I talk here about a subset) who build clustered dump sites (a subset in a subset) have more parameters to chose their dump site locations than just availability. Why do you think, they like forests, creeks, beaches and combinations of those places so much for their dump sites? Take a look at Bundy, Ridgway, and Corll, just for example.
Now, we know, that serial killers, even when there is more area available, tend to follow those patterns. Which sometimes lead to funny results, as in League City, Texas, for example, where one reused the dumping ground of another one because they ran out of fitting grounds. While, without doubt, Texas has more free space than any other state.
4.) If you argue with math, try at least to get it right. The number you try to reason with is 5 dead prostitutes per square-mile. Not 1/per/mile, which makes mathematically no sense at all. However, also 5/square-mile is a lot, at least till you look at the other parameters, which tell us, there is one cluster of four in that number. So we end up with two groups/square-mile. Which per se is not that much. So there is no need to do any stunts to add them all together, just to make a point, because points made on the base of mathematical errors are not really points.