In the grand scheme of things, on the scale of importance, human rights are important, and the arguments that some people put forward against them are a zero.
Whats better, people marrying one another, or killing one another? I know which one I would prefer to see. As somebody who grew up protected from but later, being hurt deeply by a similar, quite cruel kind of discrimination - against children of unmarried parents, I know what thats like and its utterly evil. It's changed my outlook on life.
Who cares what people's sexual orientation is? It really doesn't matter - what matters is how somebody is to other people.
Really, we're all in this (planet) together. I am very happy for Australia.