Are humans good or bad?
This question continues to fascinate us. When I lecture about human nature to my students I like to frame the debate by pitting Thomas Hobbes against Jean-Jacques Rousseau. (I should note that much of this analysis was inspired by Steven Pinker's book The Blank Slate).

Famously, Hobbes declared that primitive human life was "solitary, poor, nasty, brutish, and short."
I use Hobbes to illustrate a pessimistic view of "natural man." That is, as illustrated by his famous summation, Hobbes felt that the "natural" state of man was bestial. According to Hobbes, therefore, it is civilization that steps in and rescues humanity from our primal depravity. In this view, human nature is a nasty thing that human culture rescues.
In Hobbes' view, being "civilized" is good and being a "savage" is bad.

In contrast to Hobbes' view that primitive life was "solitary, poor, nasty, brutish, and short," Rousseau declared that humans in earlier times were "noble savages." According to Rousseau humans are naturally and innately good and it is "civilization" that turns man into a "beast." Consequently, Rousseau argued that modern man should seek to restore the conditions of our lost Eden and live a more "natural" rather than "technological" life.
To summarize, we can create a quick schematic contrast of Hobbes and Rousseau:
Hobbes:For Hobbes civilization saves us from ourselves. Without it we would regress to a beast-like state. For Rousseau, civilization is killing us. For Rousseau the goal is to reclaim a more natural existence.
Human Nature = Bad
Civilization = Good
Rousseau:
Human Nature = Good
Civilization = Bad
So, who is right? Hobbes or Rousseau?
Unfortunately, by this point in my lecture only about two students are awake. So, to show them that this question is actually of practical and not just academic interest I like to ask the following question: Are you planning to breast-feed your baby?
(This question gets the girls awake, for obvious reasons. It gets the boys awake because the word "breast" was used. Human nature, good or bad, can, at times, be remarkably predictable...)
I bring up parenting in the conversation about Hobbes and Rousseau because it is in parenting where we tend to reveal if we vote with Hobbes or Rousseau.
For example, Hobbesian parents tend to think that a child's nature is unruly, undisciplined, and selfish. Not in an evil sort of way. More of a benign "they don't know any better." Thus, these parents tend to emphasize training and structure.
Rousseauian parents tend to think that a child's nature is innocence and goodness. These parents tend to deemphazie structure in the child's environment.
Here are some more possible locations of contrast:
Painkillers during delivery:Now I'm not suggesting this as some kind of rigorous, diagnostic classification. I'm mostly trying to illustrate a point: Whether we like discussing human nature or not we are all working with a theory of human nature and that theory of human nature has practical consequences.
Hobbesian parents more likely to use painkillers
Rousseauian parents more likely not to use painkillers
Feeding:
Hobbesian parents more likely to bottle-feed
Rousseauian parents more likely to breast-feed
Feeding Times:
Hobbesian parents more likely to feed on a schedule
Rousseauian parents more likely to feed on demand
Discipline:
Hobbesian parents more likely to spank
Rousseauian parents more likely not to spank
Sleeping:
Hobbesian parents more likely to allow child to cry in crib until asleep
Rousseauian parents more likely to hold child until asleep
For example, when parenting, some of us go "natural." Others are more "technological" (e.g., painkillers, formula, behavioral parenting strategies).
And parenting is hardly the only place where we see these differences. We see Hobbesian and Rousseauian contrasts in how we choose to eat, how we choose to use medicine, and how we feel about city life. To name a few things.
Hobbes and Rousseau are still with us. And we, in the choices we make, help keep their debate alive.