Do we want to know how our genes influence our behaviour? This knowledge may eventually lead to new ways of treating anxiety, addiction or eating disorders. But people may try to use it to excuse violent or criminal behaviour. Others, particularly employers or insurance companies, may use it to discriminate against certain people. There are also fears that in the future, in pursuit of a genetic 'ideal', parents will genetically 'improve' their children by getting rid of 'undesirable' characteristics before they are born.