Other than tests in the US, I'm pretty sure it was only used in war zones (North Korea and Vietnam). To me that's pretty nonobjectionable (not that I necessarily agree with the decision to have those wars, but if we're going to invade a country I'd rather we do it right). The Air Force's version (SR-71) actually has quite a few fans, even amongst people that aren't fans of mass surveillance. It surprises me that even if you don't agree with the use of the airplane, you can't even see why people would be willing to work on it. There's always going to be people that want America to have the biggest/best/most tools in its arsenal. Even if the events going on in SE Asia weren't a direct threat to the US, the A-12 was designed less than 20 years after Pearl Harbor. America got its ass kicked by due to inadequate knowledge of a foreign military's movements. It was that generation's equivalent of 9/11.
Anyways, the slogan is a bit tongue and cheek anyways. I don't think that sort of dark humor is uncommon, especially in military/intelligence circles. Check out some of the NRO mission patches and slogans. Some are definitely designed to troll Illuminati/New World Order conspiracy theorists. My favorite is an octopus encircling the Earth with it's graspy tentacles.