I guess my issue with your statement is that it seems almost impossible to disprove short of someone doing the unthinkable. We have history to suggest (note: not prove) that MAD works.

It’s kinda like economics. We can’t really prove anything in economics works the way we think it does, but we have a bunch of REALLY GOOD suggestions to support our hypotheses.

MAD isn’t a natural law - it’s a social construct, very much like economics.