Viacom is one of several major companies — including Google, CBS, Zynga, Diageo, Levi Strauss, and more — to file a court briefing opposing the Defense of Marriage Act (DOMA), which defines marriage as between a man and a woman.

Before you get all giddy and go to Times Square to hug Viacom’s building, MediaPost reports that the company didn’t do this just because it is pro gay rights:

The amicus brief does lay out a self-interest case why DOMA hurts businesses because there is a disconnect between laws in some states and federal legislation. So what a Viacom or a Blue Cross or a Starbucks could gain from a repeal. The filers say that DOMA forces a company to keep separate records; increases tax payments; can necessitate hiring expensive compliance firms; and bring a need for added employee training.

In other words, DOMA costs more.

But hey, let’s not be negative nellies here. Let’s just be happy that Viacom and others did this, no matter what the reason was.