Why discommode 97% of the population to the benefit of
3%?

The rights of the 87% (number closer to reality) are not diminished when those
rights are extended to the remaining 13%.
We can't recognize rights based on percentages. If only 10% of the population
is African American, why should the 15% of the remaining population that has
deep seated hatred for African Americans have to put up with them? Same sort of
argument, but nobody would ever suggest that other minority groups should have
fewer legal rights because they are outnumbered by the bigots.

Even George Bush said he was in favor of civil unions. ( he may have
flip-flopped since). That's all anybody should expect from the state. Let the
churches decide who is "married" (baptized, confessed, etc)
and leave the state out of it.