And no, obviously laymen are not more likely to understand the implication, as evidenced by the "eugenics is good, actually" crowd in this thread.
>it would require having access to the genome of every single person you want to manage
Only in this dystopian hellscape you're imagining. This isn't about micromanaging individuals. Its about better understanding the origins of behavior in society. Here's one immediate potential application: how can you be sure that quotas in hiring aren't unrealistic and counterproductive if you refuse to research the effect size of genetics in human interests?
My overall point is that we don't know the answer to these questions and there is an emergent social pressure which presumes a worst case application of such research and does not allow for it to be conducted. This leads to assumptions pervasive in social, medical, and academic practices which we don't know to be true. What if effectiveness of psychological interventions hinges on genetics? Should such research be forbidden because of totalitarian fantasies?
Genetic screening has many great potential benefits, but the Iceland Down's example is not their best showcase.