The only thing of black holes that violates our known laws is the information paradox. Realativity and Lorentz transformations correctly predict black holes' event horizons and time dilations. The information paradox is that the singularity supposedly destroys energy and matter. Energy can be converted between matter and vice versa, but it cannot be outright destroyed. On top of that, math itself breaks at a singularity, because there is a measurable mass but zero volume. Hence, dividing by 0 to calculate density, which is generally defined as undefined.