Referring to Paul again, he mentions in 1 Corinthians about when some things be good and when they are not. The example he cites is about eating meat prohibited by the Old Testament. For some Christians, seeing another Christian violating that is troublesome, which is Paul's point.
Whilst the issue of homosexuality is hard to apply under the same guidelines, I can see how it could be. The trouble is when those in authority in the church fail to recognise when their decisions in this could damage the faith of those in their charge.
Wade.