The ship’s crew sampled homo sapiens during a previous pass through around three thousand years ago. We tasted too gamey. It didn’t seem likely that we’d become more marbled and deliciously sedentary in just a couple thousand years, so they merely made passive scans on the way by.
The exec might look at the imagery later when they’re already too far past to turn around. If we’re lucky, he and the captain will decide to delete the whole mess of scan data and claim an untimely solar flare scrambled the equipment.
But if they get too ethical about it, home command’ll be sending a larger harvest vessel. The captain, exec, and navigator from the survey ship will have been fired for cause because they didn’t pick up a dozen or so meat samples on their way through, but we might not feel so appreciative of our visitors' high standards while home command argues about whether 10% or 12% of the human population is the appropriate sustainable harvesting level.
Let us pray that the exec values his job over his integrity.