We rack up quite a lot of awfulness with eugenics, phrenology, the "science" that influenced Stalin's disastrous agriculture policies in the early USSR, overpopulation scares leading to China's one-child policy, etc. Although one could argue these were back-justifications for the awfulness that people wanted to do anyway.
Those things were not done by awful people though - they all thought they were serving the public good. We only judge it as awful now because of the results. Nearly of these ideas (Lysenkoism I think was always fringe) were embraced by the educated elites of the time.
Lysenkoism! That's the one. Thank you for reminding me of the name (and for knowing what I was grasping at).
I think some "bad people" used eugenics and phrenology to justify prior hate, but they were also effective tools at convincing otherwise "good people" to join them.
