Zemo’s stance about superhumans is understandable on some level, but on another level it makes no sense because it is fundamentally saying science and technology should not progress. Sure, Erskine’s serum augments people to beyond human performance. But so does the Iron Man armor, and to a much lesser extent, real-world technology like eyeglasses, binoculars, smartphones, etc. Levers and pulleys increase the lifting power of humans beyond their original limits.
I suppose one could focus on the current inequitable distribution of superpowers, making him sort of an inverse to the Incredible