The Genetics Enhancement Problem Articulated by Glannon

Evaluate the genetics enhancement problem explained by Walter Glannon in Bioethics: Principles, Issues, and Cases by Lewis Vaughn.

On the question of genetic enhancement, Glannon argues that a line of demarcation can be drawn between treatment and enhancement. Some have argued that it is mistaken to think so since certain forms of enhancement are employed to prevent disease. What does Glannon ultimately think the problem with genetic enhancements is? Why does he think this?