The report examines the grounds on which it might be claimed that this burden of justification has been met. The risk of genetically abnormal children is one such reason; but, even if it were sufficient, it would justify only a prohibition that was both narrower and wider than the current prohibition on incest.
报告还分析了为什么有人认为上述举证责任已经履行完毕。理由之一是有可能生出遗传异常的子女；但即便该理由足够充分，也只能证明应当收窄或者放宽目前的乱伦禁令。