Why would the internal nuclear/degeneracy pressures in a black hole increase slightly incrementally more than gravity as mass is added, leading inevitably to a big bang explosion upon surpassing of critical mass, the same mass as our own big bang? A number of reasons.

First, as matter is added to regular atomic matter, an increment of gravity is added along with an increment of internal nuclear/degeneracy force; however, a portion of that increment goes to work outside of matter as electromagnetic fields and charged particles, and not internally toward the structure of matter. In a black hole, however, the weak force is trapped entirely inside of matter, and the black hole has a mostly neutral charge. Thus, the entire increment of nuclear/degeneracy force goes inside of matter, and none outside, as mass is added.

Secondly, to the extent that beta decay is an energetic event, consisting in part of the weak force pushing out to work partially outside of matter as electromagnetic fields and charged particles, the force of beta decay is reinserted into matter via electron capture in collapse to neutron star or black hole. Thus, a black hole core contains the force of beta decay for every 3 quarks in the core, whereas regular matter does not, and this force increases as matter is added to a black hole, whereas it doesn't in the case of adding matter to regular atomic matter.

Thirdly, some say the strong force manifests as a repulsive force in the situation of extreme fundamental particle confinement, as in a black hole, a force not actively at work in a repulsive way in regular atomic matter. In any respect, as mass is added to a black hole and gravity takes over an ever-increasing role toward binding the core, the strong force would be freed up from binding duties to work toward recapturing the space needed for hadron formation.

Face facts, big bangs must come from black holes because they're the only source of primordial matter in the universe. Think about it. If you had the desire and ability to launch a big bang of your own, and you went searching the universe for supplies to begin your preparations, the only place you could possibly find your essential starting materials, namely, trillions of solar masses worth of individual trillion degree fundamental particles, is inside of black holes. Additionally, if you planned to prepare today and launch tomorrow, the only place you could possibly store your particles overnight would be inside of a black hole. For that matter, the only possible way to pull together trillions of solar masses worth of individual fundamental particles all to a single location is via the mechanics of a black hole. This would seem to indicate that there is no place other than a black hole that a big bang could possibly originate from.