OK, I hope my question doesn’t get misunderstood, I can see how that could happen.
Just a product of overthinking.
Idea is that we can live fairly easily even with some diseases/disorders which could be-life threatening. Many of these are hereditary.
Since modern medicine increases our survival capabilities, the “weaker” individuals can also survive and have offsprings that could potentially inherit these weaknesses, and as this continues it could perhaps leave nearly all people suffering from such conditions further into future.
Does that sound like a realistic scenario? (Assuming we don’t destroy ourselves along with the environment first…)
Survival of the fittest doesn’t mean what you think it means. Fitness, in the evolutionary sense, is a quantitative representation of individual reproductive success. So yes, the fittest of us do survive in the sense that their genes are passed on far more often than those that are less fit. For example, the overweight, nearsighted, diabetic car salesman with a lethal peanut allergy that has 16 children is more fit than most people on the planet.