Ralph Merkle — American Scientist born on February 02, 1952,

Ralph C. Merkle is a computer scientist. He is one of the inventors of public key cryptography, the inventor of cryptographic hashing, and more recently a researcher and speaker on molecular nanotechnology and cryonics... (wikipedia)

If you look at the human condition today, not everyone is well fed, has access to good medical care, or the physical basics that provide for a healthy and a happy life.
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.
Manufacturing takes place in very large facilities. If you want to build a computer chip, you need a giant semiconductor fabrication facility. But nature can grow complex molecular machines using nothing more than a plant.
If we attempt to block the development of new technology, we effectively have ensured that the most responsible parties will not develop them.
Nanotechnology is an idea that most people simply didn't believe.