I think people weren't specifically refering to act or belief in humanity, but humanity in terms of a species. Ergo saying that our species is shit.
When there is no other point of reference I wonder what people are comparing it to.
I also have a strong belief in humanity, becuse we are capable of great things.
The problem is:
It is like the breakthrough of splitting the atom, do you use it as clean energy for the world?
Or do you wipe the world clean?
I don't think that wiping the world clean would change the inherent qualities of ourselves as creatures, so that would be an exercise in futility. I think dealing with what we have now is the best bet, as we are already well acquainted with our flaws and our strengths. No need to start over.
Emma Lazarus conceived of it and we broadcast it to the world in true uppity American fashion.
"Huddled masses?" "Wretched refuse?"
"No ray of sunshine is ever lost, but the green which it awakes into existence needs time to sprout, and it is not always granted to the sower to see the harvest. All work that is worth anything is done in faith." - Albert Schweitzer