One of the tests of a good scientific theory is its ability to make predictions.  If the predictions come true, the theory is good.  If not the theory is reworked.  As yet we don't have a good scientific theory that covers all the known aspects of the universe.  Quantum mechanics works for little things like atoms and molecules and smaller.  Relativity works for big things like planets and stars and galaxies and bigger.  But the two theories don't work together.  Stephen Hawkins, in his book "A Brief History of Time," discusses this problem.

I can only begin to imagine how Einstein's brain worked.  He basically came up with his theory in his head.  That is to say he worked with concepts and ideas instead of tangible objects.  He just assumed that gravity moved at the same speed as light.  He was long dead before this stellar observation proved his assumption right.  In his time though, his theory was used to make the atomic bomb.  They say that's why he always looks sad in pictures of him.

Einstein had the mind to come up with the Theory of Relativity, but he didn't have the power to stop others from using it for deadly purposes.  It's like in the movie, "Bandits," where Billy Bob Thorton's character laments, "I hate being smarter than everyone else. I always know what's going to happen next."

Science can be used for good or evil.  For every scientist with principles who would never use it for evil, there is always another who would.  Einstein's theory is proving that it makes good predictions of how the universe works.  Can anyone predict how his theory is going to be used next?