I've looked at the evidence and don't think it is as solid as you do. It also is hard to reconcile the recent trend away from saturated fats with diets that we know are healthier than modern diets, e.g. French cooking that uses lots of butter, a saturated fat. Or Mediterranean cooking that uses lots of olive oil, which is one of the more saturated cooking oils (it also is fairly high in unsaturated fat). I think there is more going on here than the nutrition studies indicate.

I certainly agree about trans-fats. I would never suggest they're healthy. I don't think satiety is the full story about why fast food is unhealthy, nor just the lack of nutrients. It seems to be actively bad. And I'm obviously not focusing on only the fats used during cooking, but I was responding to a comment about palm oil, not about nutrition in general.

Edit: I'm not convinced saturated fats are healthier, either, but I think the science here is very sketchy and generally of low quality.