I am not suggesting that they may not choose to marry a member of the opposite sex, but that most homosexuals who devoutly follow your faith will live a chaste life, as is recommended by your magisterium (CCC 2357– 2359). How are those homosexuals who choose celibacy not "hurt[ing] the women who are not made wives" and not "hurt[ing] the parents that are deprived of grandchildren"? A sacrifice to God and benefit to humanity would not negate your hypothetical consequences.
Furthermore, homosexuality is a sin that hurts other people. It hurts the women who are not made wives, it hurts the parents that are deprived of grandchildrenIn addition to Michał's point, your own church teaches that homosexuals should live in celibacy. If they adhere to that, then there won't be wives or grandchildren.
No that is not what the Church teaches, there is nothing prohibiting a person who has committed sins of sodomy or who experiences disordered attractions from getting married to a member of the opposite sex.
If a person does not get married for the sake of heaven, as a sacrifice to God and/or to dedicate themselves more fully to God then it benefits mankind. The disordered use of sexuality does not benefit anyone and hurts people.
The point of my remark was not to show that being the chief consequence of Homosexuality or to state that those are the main evils that flow from it. The point of my remark was to refute the idea that the sin of homosexuality is a private sin that has no impact on the rest of humanity. I provided those examples and I stated that it disordered the individuals passions.
2357 Homosexuality refers to relations between men or between women who experience an exclusive or predominant sexual attraction toward persons of the same sex. It has taken a great variety of forms through the centuries and in different cultures. Its psychological genesis remains largely unexplained. Basing itself on Sacred Scripture, which presents homosexual acts as acts of grave depravity,141 tradition has always declared that "homosexual acts are intrinsically disordered."142 They are contrary to the natural law. They close the sexual act to the gift of life. They do not proceed from a genuine affective and sexual complementarity. Under no circumstances can they be approved.
2358 The number of men and women who have deep-seated homosexual tendencies is not negligible. This inclination, which is objectively disordered, constitutes for most of them a trial. They must be accepted with respect, compassion, and sensitivity. Every sign of unjust discrimination in their regard should be avoided. These persons are called to fulfill God's will in their lives and, if they are Christians, to unite to the sacrifice of the Lord's Cross the difficulties they may encounter from their condition.
2359 Homosexual persons are called to chastity.
By the virtues of self-mastery that teach them inner freedom, at times by the support of disinterested friendship, by prayer and sacramental grace, they can and should gradually and resolutely approach Christian perfection.
The Catechism of the Catholic Church.
You'll also notice that nowhere in the Catechism of the Catholic Church does it say that homosexuals are called to celibacy, it says chastity. I took a vow of chastity myself when I took my vows, but it is understood within the context of my marriage.