I was referring to the uproar from the residents near where I live (which is part of an eruv) about a mosque being set up there, as reported by major press outlets:
https://www.theguardian.com/uk-news/2017/oct/14/golders-gree...
https://www.independent.co.uk/news/uk/home-news/islamic-cent...
https://www.standard.co.uk/news/london/faith-leaders-condemn...
The point I was going to make was that they appear to care deeply about what is inside the eruv (e.g. a mosque). You say it is just about pushing a stroller around and they don't care about what is inside my house etc, but we can see that if someone tries to set up a mosque inside their self-declared jewish area (i.e. eruv) and it is literally national news due to the level of anger and racism.