I don’t really understand the question.
But as I see it everything has a cause - for example, in nature, light and warmth come from the sun, cold and dark do not have a source but are due to the lack of the sun, or an artificial light/heat source.
With animals, many apparently cruel acts are necessary for the protection and long term survival of the species.
Humans have all of the ‘animal’ instincts but something else as well, we are not bound by our instincts and in most people these are transcended by goodness and kindness a lot of the time. Without ‘goodness’ people can be worse than animals, not because of some source of evil, but because they have given in to selfish, materialistic, physical desires without ameliorating them with any degree of goodness, even though it seems to be innate in us (just watch ‘the secret life of four year olds!).
So yes, I think there must be a transcendant ‘source’ of good out there.