The inevitability of human suffering

We may yet get to a utopian future where war, genocide, discrimination, inequality and other major human-caused sources of human suffering have been eliminated. But was it possible to get from where we started to that endpoint without such human-caused suffering?

The answer to that question can only be "no". Suffering exists throughout nature, and through all of humanities ancestors even before they took a form that resembles modern-days humans.

Do the atrocities of the twentieth century represent humanity's nadir? And hence should they be the focal point of our rememberance? Or should we seek to remember all human-caused human suffering throughout our history?