All of this strikes us as not only far-fetched, but also a wee bit undesirable. We don't need a technology that would allow Donald Trump to replicate himself a million times. At least they aren't like any machine that any engineer would consciously design. Computers are, for the most part, linear devices. They won't possess anything like consciousness until they learn how to think in a sloppy, indirect, chaotic fashion.
Humans take all kinds of mental short cuts.
We actually benefit from our tendency to make mistakes. Someone has thought of everything. DuPont makes Teflon Fabric Protector. If you've bought a bowling jacket lately, you're probably protected by Teflon. It is literally melted on the individual fibers of a piece of clothing to make the article stain-resistant, among other things.