Lucy, you have to kill and sterilize innocent human beings in order to create a world of genetically perfect human beings.
Are you prepared to do that?
To save world to create world with perfect beings, 100% healthy and vital, it's worth it and future generations years from now would built monuments and statues in our honour.
Who determines what "perfect" is?
Are you willing to volunteer to be sterilized, if you don't meet the standards?
If I had hereditary disease, I would believe it my duty to society to be sterilised.
Pardon me while I don't believe you.
Not to mention, if you're really a "blue blood" from a thousand year old aristocratic family, you almost certainly have a number of hereditary defects.
I had full extensive medical at age 18 and they said I'm normal.
A "full extensive medical" doesn't examine your DNA. You know that, right?
You're "normal" now - but that doesn't mean you won't die of some hereditary disease hiding in your DNA 30 years from now.