I find it disturbing that FB sees itself as the arbiter of which events and what people are in need of alerting.
I don't. For many people it's their primary communication platform, and things like this are to a large extent driven by demand for such features in the wake of previous tragedies/disasters, after setting up impromptu groups or check-in mechanisms. It's not a simple problem to solve. Now I don't think they're doing it very well and the fact that it's subject to the typical feature creep is a problem, but then feature…
Do you have a citation for this claim that 'FB is just answering the demand'?
>"It's not a simple problem to solve."
Who asked them to solve it?