Blood carrying what it physically carries is a fact no one is disputing. The concept that is archaic is that people strongly resemble their parents in character, because they are birth parents. The reality is that the nurture of the parents plays a much bigger role than genetic lineage. It is not uncommon for people to punish someone for a relatives actions, basically for something the relative has no power over. This is as unethical as punishing someone for being of a certain race, something the person has no control over and something that has no presently measurable impact.

I'm not the biggest Hollywood fan, but what do you think about movies like Gattaca, Minority Report?

We aren't even anywhere close to such fictional understanding of the role of DNA and nature-vs-nurture mechanics of human development, or even what sentience is. And you think we can use DNA to judge people? I never said "lets pretend heritability doesn't exit", I implied we can't judge people based on whatever you think we do know about it.

The only thing you should evaluate people on is their ability to make decisions, and if that correlates with genetics, you need to be willing and able to modify genetics to make that fact relevant.