I suppose I was lucky 20 years ago, because the instructor for my weed out class really enjoyed the topic and included a lot of historical information and stuff, the people who dropped it or failed, did so because they thought computer science would pay well but didn't have any technical skills and weren't willing to pick up any. A lot of people just don't have the logic thinking skills for STEM type programs or have no idea what programming actually involves and these sorts of classes work because they are relatively easy for the people who succeed but still allow the people won't succeed in the field to find out early on.