We are flawed on a biologically fundamental level. Humans are self-interested, socially conniving apes from the bottom up and we need to change, drastically.
Part 1: Death
Consider this: a brilliant person works all their life, gains irreplaceable knowledge, like an effective treatment for a fatal disease or virus and then dies without having managed to share their work. This scenario happens all the time to people who do not have a choice. Isn’t it the involuntary nature of death which is devastating?