Sure, but it's not like we can just sit on our hands and wait until we are 100% sure of what we could do; the welfare state is already selecting for us. And in my experience, most people are opposed to getting rid of the welfare state.
This means that the choice is not "eugenic or do nothing", it's "eugenic or dysgenic".
This means that the choice is not "eugenic or do nothing", it's "eugenic or dysgenic".