https://blogs.scientificamerican.com/observations/in-search-of-naked-singularities/

Black holes are hidden behind event horizons, and just as in Las Vegas, “whatever happens inside the horizon, stays inside the horizon.” No information leaks out.

A black hole horizon brings the added benefit of hiding an embarrassment of the theory that predicts it. Matter falling into a black hole ends up in a singularity where the curvature of spacetime diverges and Einstein’s equations of general relativity break down. Fortunately, our inability to determine the whereabouts of infalling matter as its density diverges near this singularity has no influence on the outside world, which remains protected by the horizon.