Satoshi was Killed By the Government or was so in fear for his life that he went into Hiding.

David Chaum creator of Digicash and Ecash wrote an article in 1985 and  and the Title says it all - SECURITY WITHOUT IDENTIFICATION: TRANSACTION SYSTEMS TO MAKE BIG BROTHER OBSOLETE

Satoshi BTC program Eliminated Banks,Governments and Rich Elites Which made him more of a target to the financial system of the world. His program put the People back in control of their own finances.

When you fuck with the powers and finances of the Worlds Governments you are bound to have an "accident" along the way.