“Generation after generation the honest and independent, not marrying till they had the means, and striving to bring up their families without assistance, have been saddled with extra burdens, and hindered from leaving a desirable posterity; while the dissolute and the idle, especially when given to that lying and servility by which those in authority are deluded, have been helped to produce and to rear progeny, characterized, like themselves, by the absence of mental traits needed for good citizenship.”