Genes simply don't work like that, each person doesn't just get the genes from their parents, but from the entire bloodline of each parent. Which means we get a huge mix of stuff, some of which will be expressed and a lot of it won't be. This means children might be similar to parents (but also might not be), but after a few generations it's very hard to track any kind of complex trait.

Most people are about as smart as one another, given the chance to develop and grow. Differences in perceived intelligence are often much more a product of the environment, than anything related to genes. Rich families paid for their kids to go to the best schools, thus their offspring is perceived as more intelligent.

So no the issue isn't just forced eugenics, the issue is eugenics period. Genes do not make one person superior to another and there is no such thing as an Ubermensch or master race.