To be clear, I do not blame the teachers at all for this; I do not think they took any joy giving me bad grades.
But because I was someone who knew what it was like to be a smart academic underachiever, I thought I might have luck reaching the students who I saw falling into the same negative patterns I had.
I do think I reached at least one, but I think most of them I did not. It's ok, teaching is hard. I hope a better teacher came along in these students' lives and helped them out.