Right, chazal say that we are not supposed to fight with goyim in galus. It’s one of the three oaths that we swore to Hashem. And what will happen if we break that promise? Hashem said that He would allow our flesh to be eaten like animals.
What we did before galus has no bearing on the behavior demanded of us during galus. And lest you dismiss an open genara as “agadeta”, whatever people mean when they do that, yhe rambam, who I’m sure you love quoting when he says to go to work, wrote a letter to the oppressed Yemenite community not to rebel and to keep the oaths.