Again, yes, of course. But this still isn't some exotic sci-fi tech. Proteins chaining (and folding) themselves into even more complex structures is just what they do by their very nature, and when this process malfunctions, like in the case of prions, the results are catastrophic.

However this is way more likely to be the inadvertant result of screwing around with RNA rather than nano-engineering that should be at least a few decades away if we're being optimistic. Forcing people to take an experimental medical treatment knowing that everyone who takes it is a lab rat while claiming a level of certainty regarding its safety that's simply not possible to know prior to pushing it onto everyone is already a crime against humanity, no need to make such wild extrapolations.

Again, yes, of course. But this still isn't some exotic sci-fi tech.