HIE (or whoever you are)…
I spoke with my rav* and he confirmed what I pretty much suspected… that the misuse of an eruv by some does NOT invalidate the eruv at all. I also asked him if he ever heard of the sefer you mentioned and he did not.
So, it comes back to this… you gave me a claim from a sefer which I cannot find and for which you cannot name an author. I have no idea who wrote this sefer, whether it is an authoritative sefer, or even whether or not it actually exists.
So, I put the ball back in your court. Please back up your statement that the misuse of the eruv by some invalidates it for all.
The Wolf
* A fellow who, I should point out, is opposed to the Flatbush eruv.