Once again, we can look at a myth now and realize that only bits of it were true. It doesn't mean that they knew that, or didn't know that.
I can slip some raisins into a bag of chocolates and give it to you. You still received some raisins, even if you didn't realize you received a couple raisins. The raisins can still be useful to you; they provide sustenance and nutrition, and even if the chocolate is, nutritionally, not so great for you. And sure, the chocolates will still give you some calories and potentially some energy, so they may not be entirely harmful either. But in a bag of mostly bad, you received some good, even if you don't know it.
You seem to be missing the point entirely, or are just being incredibly nit-picky.
I can slip some raisins into a bag of chocolates and give it to you. You still received some raisins, even if you didn't realize you received a couple raisins. The raisins can still be useful to you; they provide sustenance and nutrition, and even if the chocolate is, nutritionally, not so great for you. And sure, the chocolates will still give you some calories and potentially some energy, so they may not be entirely harmful either. But in a bag of mostly bad, you received some good, even if you don't know it.
You seem to be missing the point entirely, or are just being incredibly nit-picky.
If you're frightened of dying, and you're holding on, you'll see devils tearing your life away. But if you've made your peace, then the devils are really angels, freeing you from the Earth.