Because whilst we are getting all worked up about the terribly naughty act of bonking someone of the same sex, it provides the perfect excuse to ignore our abuses of the third world, people trafficking, genocide, wars, poverty in our own nation, child abuses going on under our noses, a substandard education system, elderly people living alone for weeks at a time without visitors, the rape of our natural resources, global warming, our abuse of immigrant labour and willingness to make them work on next to no pay, the people in society who have no friends, ethnic cleansing, the existence of Nuclear Missiles, racial and sexual divides still being in place in our society . . . .
Oddly enough, in my Bible, it was the latter things that Jesus spoke out against, and which receive most time in the Bible. For instance, the Bible has around 900 verses telling us to look after the poor otherwise we are failing in our worship to God.
But heck, we just ignore that truth - those 5 verses that say homosexuality provide such a nice excuse for us to vent our archaic egotistical self-righteous prejudices and also allow us to get out of doing the much more difficult job of following what God wants from the church.
So you see, WorldFriction, it is the perfect compromise!