I think most people are good but not because it's innate. I think humans are like electricity, seeking the path of least resistance. Attracted to pleasure, averse to pain, people judge circumstances and weigh their options according to what they think will be the most pleasant / least unpleasant set of consequences. Skewed by their predilection for short-term or long-term consequences. This results in people being essentially good, but not because it's intrinsic but rather because "good" generally has more positive consequences associated with it than evil.

"Should I steal this?" is always weighed more heavily against "Will I get caught?" and/or "Will this cause me guilt or affect my self-worth?" rather than "Is it wrong?"