What is 1 + negative effect that can come from applying modern values to a historical event

You don't understand the point of view of the people in the time period you've studied. They did things differently back then with the circumstances they were dealt. You have to put yourself in their shoes and see where they're coming from. For example, what may be seen as inhumane in our eyes may have been all they could do back then with the hand they were dealt.

Everyone.. i would think?