Why? Fr. Enrique Rueda spelled it out in his 1982 book, The Homosexual Network:
There is no question that one of the top priorities of the homosexual movement is to force a "redefinition" of the American family away from the traditional husband-wife-children model to a more "functional" definition based on the the notion of economic unit or any other basis that does not require heterosexuality as its foundation. The notion that a family must involve persons of both sexes is profoundly inimical to the homosexual movement. By their own definition, heterosexual relations are beyond their reach; thus the traditional family as a normative institution for human relations is unacceptable.
