The problem of low birthrate is prevalent in societies that are affluent and educated.  Countries can give parents, especially women, generous benefits such as long parental leaves, child-care subsidies and good access to child care.  The Scandinavian countries have tried that and their data have shown their birthrate only has marginal increase.  In immigrant countries like USA and Canada where their population growth rate is not zero or even negative is only due to immigration.  The fact that King said what he said has nothing to do with 'low birthrate', it has everything to do with 'babies from undesirable people'.  When incidents even violence with racial overtones have flared up in US, people who long harboured racial bias or even bigotry now feel emboldened to come out from the woodwork and 'exert' their rights after Trump's victory.  That is the most damaging thing to the American society with Trump in the White House.  The damage he will do will last for years to come.