Because the issue is far more complicated than you might like it to be. And just because you don't see it as so, doesn't make it not so.
By the way, I'm saddened because I can see both sides of this issue. I know this situation is complicated, and that there are ramifications on both sides. I am glad that the will of the people was upheld on such a difficult issue, and yes, I'm glad to see traditional marriage upheld, as I think it's important for both families and society (and I'm also glad to see democratic principles upheld), but yes, for some this has ramifications, and that brings me no joy.