Actually, the Catholic dogma is that it is not a sin to BE gay or homosexual, or even to have homosexual thoughts or desires - rather it is only a sin to actually HAVE homosexual sex. Homosexual sex is considered (by Catholics) a subset of the larger group of sins involving sex for non-procreative purpose, outside the framework of a heterosexual marriage. Homosexuality is considered (by the Vatican scholars) as no greater a sin than masturbation, or heterosexual sex outside of marriage, or use of a condom within marriage to prevent pregnancy. Therefore, unless it can be proven that this gay couple are actually having gay sex on a regular basis, I don't see how it can be known with any certainty that they are actually living in sin. Perhaps they are entirely celibate. Assuming they are having sex, their sin can be considered (as per Catholic dogma) no greater than the sin of a parent who masturbates, or the sin of parents who use condoms during sex to prevent pregnancy. Unless this group of disgruntled parents has set up a spy cam in the gay couple's bedroom, and know for a fact that the two men are scr$wing each other, then the idea that the two men are sinning is a mere assumption. 🙂
Also, it is not a sin to attend a gay pride parade, or to support gay rights, or to oppose discrimination against gay people. In Catholicism, the sin is the actual sex outside the context of marriage (or sex that has no chance of leading to procreation.)
