Who is 'they'? Many people are interested in doing things to keep people healthy, to improve healthcare, to improve quality of life.
It's useful to know who can have what types of risk factors with any disease, regardless of the why. It's not a explain it away, it's explain it so we can target the help appropriately. If something is socioeconomic, then those socioeconomic groups need to be reached out to when there's a way to help manage it. If it's genetic, then we need to reach out to those with the genes, which can look different than the socioeconomic group. The way of managing may be different as well, depending on the cause.