I find this a comforting thought.
When I consider the seediness, depravity, cruelty and greed of humankind, I reflect that we are only beginners. We are still practicing; we haven't worked it out yet; we have time to improve. We have been around in our present form for a few million years- nothing in evolutionary terms- and civilization- the attempt to live in a civil society- is a very recent development.
We have only had writing for about three thousand years.
The written history of my own country goes back (and then only patchily) for two thousand years. If we want to know what happened before that we have to get out our spades and trowels and dig.
Two thousand, three thousand, four thousand years- these are ridiculously brief stretches of time. We have emerged from the forests, blinked and looked around a bit. That's all we have had time for. We are still little more than beasts.