We are to defend the weak. Speaking for those who cannot speak is good. Abortion is bad medical practice. A doctor faced with a pregnant woman has two patients, he should not kill either of them. These secular arguments are persuasive, but for the Christian, with the truths of the Scriptures in his hand and the love of Christ in his heart, they become inexcusable and irresistible.
Christians are to have a special concern for the disabled and needy.
Secular humanism wants a world for 'the big, the bright and the beautiful'. It has no time for the disabled, in fact, it wants to destroy them. It is the re-emergence of that old eugenics. Many support the detection and destruction of the handicapped. The handicapped child is still made in the image of God.