What happens to the matter black holes absorb?

It gets pulled into the Singluarity at the center of the Black Hole. That's it. No parallel universes.

No White Holes. No wormholes.

Stars have mass not black holes. Black holes are not solid objects or made of matter. Black holes do, however act as conduits for extreme gravity which give the illusion of black holes having mass.

While all matter is disintegrated at a black holes event horizon all of its energy goes toward or into the black hole itself. The mass is still there amongst all the separated particles of the matter but is so sparse it may be undetectable. The extreme gravity is detectable at a black hole and this is what more than likely gives the impression that black holes have mass.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.