Thank you for another science blog, Jay; I always enjoy them. Have you considered proving yourself right? Theoretically speaking, a real study of reared apart identical twins (separated at birth and reunited by the study) would prove you correct: the environment rather than genetics predominately shapes behavior. While this seem impossible with a human population as witnessed by the details of the Minnesota Study of Twins Reared Apart, it should be rather easy with non-human primates. Miniature monkeys regularly have twins that can be separated at birth and raised in different families; this would easily prove the critical importance of the environment. Our national primate research centers annually accept citizen ideas about primate research; I hope you consider asking them to do an experiment to validate their behavioral genetics research.