The problem is that none of us lives long enough to be able to give a proper evaluation of history, especially near-history, and so perspective is always an issue.
The only kind of reliable evidence one has to which to cling comes from personal experience, and as that is as varied as the number of people sharing Earth at the same time, the chances of a happy consensus is fairly remote.
I experienced one reality and even my kids another as they grew into adults. What was my norm was one thing, but I'm perfectly sure that it wasn't anyone else's normality. Even my job put me into singular territory as far as anybody else we knew saw normality. If my wife ever developed one stock reply in her life, it was to women friends who asked her if she was upset at my photographing delightful women: she always retorted that well, their husbands had secretaries around them at work all day, every day, didn't they?
So really, the idea of right and wrong as a sort of popular reality of how "it should be" is nothing more than compromise on all sides, the adopting of stances and the projection of one person's way onto another. It's why we have the usual problem of children rebelling agaist everything for which they think their parents stand, only eventually to come to broadly similar attitudes themselves when they age sufficiently to have been bruised a little bit and have tried to make their own way in life. It's the basis of the old one about "if you're not a Socialist at eighteen there may be something wrong with you, but if you are still one at forty, then you know there is something wrong with you" joke.
Rob