Provable moral facts have nothing to do with this because humans aren’t philosophically consistent, and societies are ruled by humans. Defining them and getting enough people to agree to those definitions to enforce them is the problem democracy is supposed to solve, but in the end, flawed leaders will be ruling a flawed populace. No matter how cut-and-dried those moral facts are through rigorous philosophical analysis, societies always navigate through the lens of perception, which can be swayed.