Human society evolves rapidly day after day. There have been many glorious achievements for humanity in the quest for evolvement and self-discovery. Sadly, there are far too many atrocities in human history as well. From the smaller and publicly unknown crimes committed inside a family home to World War-level atrocities, humans have proved time and time again that they can be a truly vicious species.
Egoistic reasons, insanity, greed, or just the sheer audacity of the power-hungry human race wanting to exceed nature itself leads to dehumanization and often reveals society's crumbling infrastructure.