While manipulating genes and cultivating a "perfect" population may promote more "positive" physical traits, it introduces far more damaging false biases. In "Gattaca," many characters, particularly Anton, believed that gene sequencing was final; a person's worth was determined solely by a sequence of nucleotides. Most genes are not fact, just a predisposition. Often, one can be predisposed to a trait, but it truly is the environment that leaves this trait dormant or forces its expression. For example, many carry the "alcoholic" gene, but childhood trauma and other social triggers are much more pertinent to the development of this disorder. In Gattaca, however, the genetic predisposition is law–one's entire life is determined just minutes after birth. There is no room for growth, and Vincent tells Irene, "They have got you looking so hard for any flaw that after a while, that's all that you see" (Gattaca 1:26:19). They completely invalidate the lives of "invalids," telling them nothing but their ensured inferiority, forcing most into "lesser" jobs. As a child, Vincent dreamed of going to space, but his parents tried to quash his ambition, telling him not to aspire to anything more than a cleaning job. In a society built on genetic manipulation, "invalids" are thought to be worthless. People as brilliant as Vincent are pushed down to janitorial work and their potential is disregarded because of their genes. Genetically perfect people, however, are placed on a false pedestal–despite being physically manipulated into perfection, Anton still loses twice to Vincent in their games of "chicken," needing to be saved by his "lesser" brother. Eliminating certain diseases would have a positive effect on society, but the overall impact of genetic manipulation would be far more detrimental due to the excessive mapping that would occur.
While I don't support the process, I would most likely reproduce using the genetic modifications. In a society like Gattaca, a "faith baby" is almost ensured a difficult and unrewarding life–not because of genetic inferiority, but because of the society in which it would grow up. Vincent remarks after being rejected from countless jobs that they now "have discrimination down to a science" (Gattaca 19:10). I wouldn't want to put my child through the difficulties of a "borrowed ladder," forcing them to commit fraud and lead a fake life. A "faith baby" would have to fight an uphill battle every day, and I would prioritize my child's success over my moral objections to the process.
Gattaca is based around similar principles to eugenics–the idea that certain genes code for a "better" person. There is no way to truly map the worth of a person, but both Gattaca and the pseudoscience of eugenics strive to do this. They try to define a person's characteristics, things shaped by one's environment, by what's in their cells. While people can be predisposed to certain traits, there is really no code for the "perfect" person, and to assign levels of superiority based on genes is to invalidate the existence of many capable people. In Gattaca, it seemed that racial and sexual discrimination had largely been eliminated, although there were a few references to parents' specific desire for a fair-skinned baby. They replace racism and sexism, however, with a new type of discrimination–genetic code. Both our society and Gattaca determine peoples' worth off non-consequential traits, falsely labeling certain groups as inferior and placing them in lower positions of society. The film questions this labeling, showing an "inferior" person reaching immense levels of success, proving his family and the system incorrect about his capabilities and potential. This is synonymous to the discrimination women have faced throughout time. They are told they cannot achieve as much as men, that they are physically incapable of "mens' jobs," but in the last centuries, women have shown this to be incorrect, proving their equality time and time again.
Genetic manipulation is unethical when taken to an extreme. It can be helpful in eliminating many fatal diseases, but will inevitably lead to a dystopian society like Gattaca. Initially, processes like CRISPR will show positive results, but will prove to be a pandora's box of discrimination; once we start going down this path, there is no end–there will always be a scientist who takes it too far. Understanding one's genes can be helpful, but we must always remember that one's true worth can never be sequenced.