To study the physics of black holes (What we presume as really dense matter) could we not simply simulate that here on earth? What if we took 1 hydrogen molecule and just crushed it with enough force that I'd fall apart and then crush it even more? I'm curious what would happen.
"Really dense" is a bit of an understatement for small black holes.
A Black hole the mass of the Earth would have a diameter of about 18mm.
And it doesn't get any easier if you start smaller. The density of small black holes is bigger than large ones:
A black hole the mass of a human would have a diameter that is no only smaller than a proton, but a billion times smaller than a proton. Consider the difficulties in crushing something that small.
A black hole the mass of a proton...
The notion that you can make a black hole by "crushing matter very very hard" is many magnitudes beyond what is realistic.
It is, perhaps, possible that tiny black holes could be created in very high energy particle collisions. We're fairly sure that no such black holes have been created at CERN. Particle collions of much higher energies occur when cosmic particles hit the atmosphere, and again there is no evidence of black holes being created but we are looking: https://arxiv.org/abs/hep-ph/0112247
Our most powerful accelerator has yet to make any quantum black holes; https://home.cern/resources/faqs/will-cern-generate-black-hole If it had, that would be big news.