It is often said that criminals lack a sense of morality. If this is taken to mean that criminals don't understand the difference between right and wrong this is demonstrably false. In fact a great deal of successful criminality – I mean the profitable kind rather than say drunken violence on a Saturday night – depends on a nuanced appreciation of moral norms that is often much more sophisticated and thorough than their targets, together with a willingness to ruthlessly exploit them. They are accomplished moral anthropologists and parasites upon morality. Consider the con-artist and the extortionist.