"But I prefer here to stick to a strictly logical line of distinction, and insist that whereas in all previous persecutions the violence was used to end our indecision, the whole point here is that the violence is used to end the indecision of the persecutors. This is what the honest Eugenists really mean, so far as they mean anything. They mean that the public is to be given up, not as a heathen land for conversion, but simply as a pabulum for experiment. That is the real, rude, barbaric sense behind this Eugenic legislation. The Eugenist doctors are not such fools as they look in the light of any logical inquiry about what they want. They do not know what they want, except that they want your soul and body and mine in order to find out. They are quite seriously, as they themselves might say, the first religion to be experimental instead of doctrinal. All other established Churches have been based on somebody having found the truth. This is the first Church that was ever based on not having found it.

There is in them a perfectly sincere hope and enthusiasm; but it is not for us, but for what they might learn from us, if they could rule us as they can rabbits. They cannot tell us anything about heredity, because they do not know anything about it. But they do quite honestly believe that they would know something about it, when they had married and mismarried us for a few hundred years. They cannot tell us who is fit to wield such authority, for they know that nobody is; but they do quite honestly believe that when that authority has been abused for a very long time, somebody somehow will be evolved who is fit for the job. I am no Puritan, and no one who knows my opinions will consider it a mere criminal charge if I say that they are simply gambling. The reckless gambler has no money in his pockets; he has only the ideas in his head. These gamblers have no ideas in their heads; they have only the money in their pockets. But they think that if they could use the money to buy a big society to experiment on, something like an idea might come to them at last. That is Eugenics."

G.K. Chesterton, Eugenics and other Evils.

I recommend reading this book, as Chesterton was one of the few voices against Eugenics in its prime, and the arguments still are good.