If people could learn to be self-sufficient then eugenics would not be necessary. Theres plenty of space on our planet to harbor life for the population we currently have. The problem comes from trying to centralize the production of power and food to a small area for the whole population.
Libertarianism is about free trade without the influence of government. I agree that society is not ready for idea as radical as that. Most people today are so indoctrinated that they must have a government telling them what to do. On the other hand i see a "great awakening" happening within the realms of the internet, and i believe this will spread.
The best thing we can do as individuals is to raise our children in a non-violent non-aggressive lifestyle. To repel the indoctrination of our youth by government entities. In order to prove that a peace loving nation is better then a war mongering nation.
Who says we cant have a utopia? The belief that this idea is impossible only inhibits the progression towards a utopia.