The Nature versus Nurture debate has been going on ever since scientists have known about genes and heredity. The debate is about how human psychological traits and how they are developed. The Nature side believes that humans are born with certain genes that determine their psychological traits. The Nurture side believes that humans are products of their environments and that their upbringing determines their psychological traits.
This debate is very important for many reasons. For example, the legal system has had many issues trying to decide whether or not they should treat criminals differently if they display psychopathic tendencies.
In the above article, scientists are looking at genetic traits in children that may help them predict future criminals. By understanding more about how these traits are passed down through genes scientists hope to find an answer.
Although scientist know much about behavioral genetics and heredity, there is still not right answer to the question. My opinion is that human behavior is determined by a combination of both genetics and the environment in which one was raised.