I think you've started on a mistaken premise: that people believe "everything" is genetic regarding diseases.
From all the many discussions here about diet/nutrition being "everything" to prevention of dreaded disease, it has been said many times in all honesty that inherited genetics can--and do--often over-ride the best of nutritional and healthy lifestyle habits.
And nobody has said to avoid improving one's lifestyle/eating habits because their genes will out-gun them anyway.
Just as genetics is not "everything" to disease acquisition or not, neither is dietary intake and exercise "everything" to preventing it.
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