When they voted in the people who passed the Constitutional amendments that made that ruling possible, and when they voted in the President who named those justices to the Supreme Court, and when they voted in the Congressmen/women who confirmed them.
Saying “human rights should never be voted on” is preposterous on its face. If you never vote on them how can a democratic nation ever legitimately enshrine them in law?
That said, I disagree with the OP. The gay marriage issue IS being voted on. It was voted on when the voters of Massachusetts elected their state representatives. If they feel strongly enough in opposition to this decision, then they will have a chance to elect different representatives who will revisit the issue.
Arnold Schwarzenegger pulled this “the will of the people” crap a number of times here, when he knew that his pet projects wouldn’t make it through the state Senate and Assembly. It all sounded very noble and democratic, except that what really happened was he paid students to go around college campuses offering free movie tickets or videogames or whatever it was to other students in exchange for their votes. Which, BTW, were for things that were not quite as they were explained to us. Basically these people were like military recruiters; they tell a fine story about how much better your life will be if you just sign this line instead of this other one, but when you read the fine print you find out that they were doing a lot of embellishing and exaggerating.
Ok, so in the case of gay marriage one of those is a non-issue. Does it behoove society to draw a distinction based around reproduction? Why not just form corporate partnerships for the regulation of property part and eliminate marriage altogether?