If you want to hold a completely antiscientific position, contend that criminality is entirely environmental and we are all blank slates who can be formed into anything by those around us or because of our socioeconomic station. In short, impulsivity is at the root of crime and impulsivity is influenced by a number of genes. To contend that we are blank slates is to revert to disproven 18th century hypotheses. I understand why this makes people so uncomfortable, but foisting an untruth on society so that many of us are unoffended is not worth the costs.