Humans are wonderful. Not always good, not always reasonable, but wonderful.
We are rich, nuanced, vibrant beings. A small portion of us are defectors but by and large we are community focused and willing to give when we feel we are not being taken advantage of.
Unless you think all your friends, yourself, and your family are garbage it is inconsistent to assume a random sampling of humans would not display the same prosocial traits you find in them.
The one thing we are incapable of doing though is handling power.