If you look at the various strategies available for dealing with a new technology, sticking your head in the sand is not the most plausible strategy.
If we can reduce the cost and improve the quality of medical technology through advances in nanotechnology, we can more widely address the medical conditions that are prevalent and reduce the level of human suffering.
A potato can grow quite easily on a very small plot of land. With molecular manufacturing, we'll be able to have distributed manufacturing, which will permit manufacturing at the site using technologies that are low-cost and easily available.
We can grow crops less expensively because molecular manufacturing technology is inherently low cost.
If you think the technology is infeasible, you don't worry about what it might do and what its potential is.
The new technologies that we see coming will have major benefits that will greatly alleviate human suffering.
The laws of physics should allow us to arrange things molecule by molecule and even atom by atom, and at some point it was inevitable that we would develop a technology that would let us do this.
A molecular manufacturing technology will let us build molecular surgical tools, and those tools will, for the first time, let us directly address the problems at the very root level.