For all their "christianity", republicans in the US are pretty hypocritical.
Jesus actually teached that everybody deserves to get fed and housed. That everybody deserves healthcare. That people should care for other people in their community. That is essentially the core principles of socialism.
There you go, sources and all. It's very illuminating.
My argument is that there is a basic moral code embedded in our genes via instincts. For example the ability to feel compassion and empathy - these are instinctual.
Now, what exactly is "good" is a philosophical question without an objective answer. But to assume our entire behavior and everything makes a person "good" is learned is pretty disingenuous, at least under the definitions of good I've most commonly come across.