I'm optimistic for mRNA technology, but I wouldn't be shocked at all if we discover we are playing with fire. And the consequences may be completely outside of

I'm optimistic for mRNA technology, but I wouldn't be shocked at all if we discover we are playing with fire. And the consequences may be completely outside of our reality; for example we might be putting selective pressure on pathogens in unanticipated ways, the mRNA may interact with other viruses, or mistakes in manufacture may harm people. There's a hell of a lot more to safety than "We engineered a new thing and it worked for a few months", and as an engineer I have heard this line before and seen it play out exactly as you would expect.