My source is common sense. I never said anyone was engaged in any conspiracy. Never. I did, however, comment on the tendency of some to label others as "conspiracy theorists" and "those people" when it comes to life on Mars. You didn't fail to disappoint. You labeled me as such despite the fact I clearly said it wasn't a conspiracy and clearly explained my rationale.
They are not hiding anything. They know it is there. They know what it is ("microbial") They need to know more to prove it as a scientific fact that will be unassailable when reviewed. If it were like say, the Amazon, they could just up and say it. All kinds of things moving around. Arctic life moves very slowly. People perceive life as something that moves around. Not a thrombolite, a sponge, or a microbial mat.
But, yeah, the idea of life on Mars is so outrageously ridiculous that they hired people who have devoted their entire careers to studying various forms of life that eke out a living in hellish environments similar to Mars. They test their cameras out on various fossils. Why not test the cameras out on a 49ers helmet? Because they don't expect to find one there. Huge conspiracy.