Vincent’s brother is more or less mentally broken and likely to face career problems if people ever investigate what actually happened with the investigation… possibly because the astronaut died en route to Jupiter or whatever. Vincent himself is likely on a suicide trip. Jude Law’s character ACTUALLY commits suicide.

Gattaca’s ending is not a happy one. It is exactly what was said during the swimming scene. It is about putting your everything into an endeavor with no care for self preservation or “the swim back”. Which… very questionable understanding of genetics aside (very clear they were on the same sauce that Kojima was…), kind of is the “bootstraps” mentality distilled to a suicide run. Some people can succeed just by virtue of their birth and upbringing. Others more or less need to kill themselves to even have a chance. And… a lot of those people never even make it to the chance, let alone have a way to appreciate it.