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DaFranker comments on Causal Reference - Less Wrong
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Your favorite example of event horizons, cosmological or otherwise, is like that. GR suggests that there can be a ring singularity inside an eternal spinning black hole (but not one spun up from rest), near/around which you can go forever without being crushed. (it also suggests that there could be closed timelike curves around it, but I'll ignore this for now.) So maybe there are particles/objects/entities living there.
Stuff thrown into such a black hole can certainly affect the hypothetical entities living inside. Like a meteor shower from the outside. But the outside is not affected by anything happening inside, the horizon prevents it.
Fair, but quantum mechanics gives us Hawking radiation, which may or may not provide information (in principle) about what went into the black hole.
Also, there are causal arrows from the black hole to everything it pulls on, and those are ultimately the sum of causal arrows from each particle in the black hole even if from the outside we can't discern the individual particles.