Well, Gattaca raises a bigger point that just "Should we discriminate based on DNA?" In Gattaca, people can choose to genetically enhance their offspring to attain certain qualities. The protagonist's parents chose to make him in a "natural" way and hence he was considered to be the less extreme version of Untermensch. The director chose to portray such policies / societal norms as morally wrong (primarily through an emotional appeal). But it doesn't touch upon the other side of this issue. How well did humanity perform after humans were artificially evolved into what by some could be considered a new species. Except a few discriminatory cases -- much less than say Women and other minorities experience at the moment -- Gattaca doesn't seem too horrible, with space ships and space colonization. The movie can be thought of as depicting a Neanderthal that happens to be stuck in a Homo Sapiens Sapiens dominated society, and after facing adversity -- eventually succeeds. I think the issue is larger than that. Perhaps it's trying to make us consider the possible collective benefits of Humankind as a whole if it were allowed to fast-track its natural evolutionary processes. After all, if all humans became "Homo Sapiens Sapiens Sapiens" wouldn't we be better off?