You’re point being that anyone that people in the past should have known the future?
History is like a mystery novel where you’ve read the last chapter first. People in the past didn’t immediately think Nazi=bad like we do today. The full extent of how evil they were hadn’t happened yet. Remember there are many things that you’re associated with now that in the future will be seen as monstrous.
Right now there are many acts of violence towards Jews by certain movements. How careful have you been in making sure you have no associations with that?