I saw something the government probably prefers I did not see, while innocently boating minding my own business in the middle of a crowded bay with my family. Most people probably didn't realize it, even if they saw it, but they made no effort to hide it. I choose not to share because A) it's nothing so exciting as a super top secret spaceship, most would not explain the significance without explanation, and B) I am aware that they would prefer it not advertised, even if adversaries probably already know.
But there is nothing illegal or even unethical about posting photos. If someone else of the hundreds out and about that day noticed and spread their pictures, I wouldn't be outraged. I'd laugh and say, "Well, THAT cat's out of the bag, guys". It's the government 's duty to secure their secrets, not the citizenry.
There's nothing in those Groom photos that could not be seen on a commercial satellite. If you don't think the base is aware of civilian air traffic, you're kidding yourself. You have to get cleared into that route in the first place. If some one left their delicates exposed (they didn't), that's not on them, not the guy tooling around in his toy with permission with a camera.