There are two types of people in the world.
There are those that believe human nature means "petty, selfish, greedy, jealousy, pride" then there are those that understand that human nature is the ability to rise above those things and far beyond them, as is demonstrated by humanity in general. Yeah there are some people who embody the first version of human nature, but for every one of them there are others and more that embody the opposite and that's human nature.

Here you are, cautioning that humans are petty, selfish, rash, etc. Obviously, absolutely nothing would ever satisfy you, every type of improvement, and kind of change, it all would fall by the wayside before Human Nature.