It is very easy to get angry at people for their mistakes and flaws. But the problem is that no observer can at present, to the best of our knowledge, do that who isn't human.
To not have faith in humanity is ultimately to not have faith in oneself.
We have grown ethically, technologically and socially. The barriers we face are institutional, and we can conquer them. And no person alive is at the limit of their empathy, their hope, their awareness and understanding.