The holocaust is the universal measuring stick for pain. One holocaust = 100%. Getting kicked in the knee: 0.00000001%. Getting mugged at gunpoint: 0.00006%. Having your family raped and killed in front of you: 1.3%.
No pain could be higher than the holocaust.
Countries like Germany, France and Israel respect the holocaust, by making it illegal to fail to evaluate the holocaust at its 100% pain level (or to consider that it is possible to do worse than the holocaust).