“We don’t rely on big-city Eiruvin, and only the litest of the lite Crown Heightsers rely on its Eiruv. And the same applies to other cities.
And while I do admit that all this is fairly normal in the Chassidisher world, it definitely isn’t in the (American) Litvishe world, and definitely not by many of those who criticize us for not being Frum enough.”
I do laud Chabad’s strictness with regards to eruvim. And, you are right that–on average–Lubavitchers are more likely to be machmir here than American Litvaks. Just one fact check: you said it’s more normal in the Chassidish world to be machmir on eruvin. This is not true. Most Chassidim have a mesora to be meikel in this halachah. Even to the degree that many hold by the Brooklyn eruvin.