Just sat and watched it, and yes, it is compelling viewing and sad too.
I encounter bats quite often over here in West Wales as part of my job as a tree surgeon and as a part time helper with the West Wales and Mid Glamorgan bat groups. We quite often find large nursery clusters and roosts, but rarely on this kind of scale.
Cap 'n chris is absolutely right, if that had happened over here, there would have been hell to pay!
We do encounter some landowners, who, out of pure ignorance to the species will 'evict' them from barns or outbuildings, but never on the scale shown in this video! very sad.