Just out of curiosity, what are notable examples of people saying “we should judge people by the standards of their time” in a reasonable way?
I most frequently hear it used for many of the “American forefathers” or other prominent people during that time to refer to their views on slavery and the treatment of indigenous people. In that case it’s clearly laughable, since A) there were prominent contemporary critics and B) a lot of those people spent considerable effort performing mental gymnastics in writing to defend these things, which one wouldn’t expect if they were simply unaware of any potential moral problems with their actions and views.