It's a way to deal with bitterness.
A couple years ago there was a poll that showed 22% of Americans (not necessarily Jeebus freaks, but c'mon), that were certain the world will end in their lifetime, Armageddon-style. That doesn't even count the percentage smarmy enough to believe it will end via fire-and-brimstone not long after they croak. Suffice to say, that's a LOT of people walking around punching timeclocks every day around us.
With the advances in human rights at local and national scales for LGBTs, some holy-rollers are thrilled... because by their estimations, our gains will "grease the skids", so to speak, toward that day of fire-and-brimstone where they plan on uttering their last words: "I Told You So! I Told You All!" You'll find many of this crew at the "Climate Change? What Climate Change?" conventions.
Other homophobes, however, never imagined they'd live long enough to see the day where gay people could look so... "gay." And in public, too! And now they're facing the realization that they're stuck on this big blue orb with the rest of us, and the government won't serve as their bully pulpit any longer. They're bitter, and pissing out venom while pretending it's "love" is the best they can muster at this stage of their lowly lives.