You talk about those who believe in the overall goodness of humanity.
And then you stated that hundreds, if not thousands, did act for good.
But the way you wrote this, you appear to be removed from your own comment.
So, do you believe in the goodness of humanity?
Given your opening sentence, you almost appear to be arguing against yourself.
PS:
God gives humans absolute free will. Each of us has the capacity for choosing good or evil. It's our choice. No evil demi-god necessary.