The AIC report on the link to genetics and crime said this.
Recent twin studies show persuasive evidence that both genetic and environmental factors contribute to antisocial behaviour. However the genetic evidence indicates that there is no single gene, or even a small number of genes, that predict an increased risk of antisocial behaviour.Where there have been some effects the increase in risk associated with antisocial behaviour is modest.
Brian, you highlighted that part of the report which was irrelevant and ignored the preceding sentence which was the important part. The first sentence said....
Recent twin studies show persuasive evidence that both genetic and environmental factors contribute to antisocial behaviour.
Got that? Of course you got it. You just hoped I was stupid enough to not figure out what you had done. Sorry to disappoint you.
The second part of the quote said this....
However the genetic evidence indicates that there is no single gene, or even a small number of genes, that predict an increased risk of antisocial behaviour.Where there have been some effects the increase in risk associated with antisocial behaviour is modest.
There may not be a single identifiable gene associated with criminal behaviour, or even a small number of identifiable genes that scientists can point to in any person's genome, and make a prediction of criminal behaviour. But the important thing is that criminologists know that there is there is a genetic link to criminal behaviour, even if geneticists can not isolate the genes or identify them. Here is the authors of the report saying just that.
This review of genetic research on anti social behaviour has summarized growing evidence for a genetic contribution to anti social behaviour, but it has also indicated that it is highly unlikely that variants of a single gene will be found that very substantially increase the risk of engaging in criminal behaviour. Instead, it is much more likely that a large number of genetic variants will be identified, that, in the presence of the necessary environmental facors, will increase the likelihood that some individuals develop behavioral traits that will make them more likely to engage in criminal activities.
Here are some other bits from the AIC report that you wanted to hide from our readers with your selective quote.
Antisocial behaviour often clusters within families, suggesting that both inherited genetic factors and family environment are risk factors for this behaviour.
They found that although genetic background has a strong influence on whether an individual will engage in antisocial behaviour, the influence of environmental factors is even stronger.
Candidate genes are specific genes that are thought to contribute to an increased risk of engaging in antisocial behaviour. They are usually selected on the basis of information about the brain-related bases of behaviour and personality traits
The inconclusive results from studies of individual candidate genes for antisocial behaviour reflect the fact that these behaviours are likely to be influenced by the interaction of multiple genes.