Well this is just delving my own personal musings: I think we’ve evolved to do our best to not understand and bury our collective heads in the sand. Being born with natural critical thinking ability (being driven to seek out maddening truth, rejecting comforting lies) and empathy ability is a rare combination. I think you need both to, as you say, understand things you didn’t personally live through. I mean real understanding, not a cold rote memorisation of facts and trivia to pass a government / post secondary tests.