Warrenellis.com � Human Echolocation

Warrenellis.com � Human Echolocation:
"Scientists have discovered that in the brains of the blind, the visual cortex has not become useless, as they once believed. When blind people use another sense — touch or hearing, for example — to substitute for sight, the brain’s visual cortex becomes active, even though no images reach it from the optic nerve. Echolocation creates its own images."

If this is true why aren't there more blind lawyer/vigilantes?