I've read that Hawking believes the Universe somehow prevents naked singularities, and made a bet about it with Kip Thorne. But it seems to me that if you take a static blackhole and continually inject material into it with high angular momentum, eventually you would have a naked singularity (since you'd eventually get an extremal blackhole). This seems very general to me. Actually, since the momentum of a particle is unbounded, technically you should be able to do this with just a single particle, correct? Clearly the answer can't be that simple. What am I missing?