>On the other hand, Silicon Valley money is made in California and draws on California services. Employees commute to work on taxpayer-funded roads and many studied at taxpayer-funded schools. And one extreme example: When a gunman shot four people on the campus of YouTube last spring, it was San Bruno police that responded to the scene.

This argument is scale invariant, you could say that any level of taxation justifies any level of services. The moral argument for not aggressively minimizing your tax burden has to pass through the question of how effective the state is at spending the money it collects, and so it must also depend on the question of how other states manage to do the same work the California Government does (having schools, roads and police) with much lower rates of income and sales tax and a much less smaller tax base.