I think that a good death is still an option because Knowledge Protects. Even just knowing about the dangers is a protection in itself. It also means that steps can be taken to prepare. For instance, if a living dude gains the Knowledge that there can be a conscious choice to go to the light upon death, and enter the protection of the silver cord, it'll be much more likely that the dude have a smooth transition to 5D. A good dose of faith probably helps, too.
A dude with a materialist mindset who thinks that the body dies and they just snuff out forever seems much more likely to get stuck as an earthbound spirit, and used by dark forces in the way the C's have said. That's puts the whole materialist push in a whole different context - it's not just a lie, it's also part of a recruitment drive in spiritual war.
This has to do with negative emotions, too. In the Baldwin Spirit Releasement Therapy book, there's a case study of a guy who held rage at a certain betrayal when he died. Dark beings approached and offered him a chance at revenge. He accepted, and became their tool of possession instead of going to the light.
What I get from that account is that what we do here affects what happens when we die. In other words, the best way to prepare for a good death is to live a good life. If we make a practice of letting go of limiting emotions, there will be less of a chance that they will be used against us in the afterlife, and we can make a smooth transition.
