I'm sure that's true in England since you saw it, but Ireland, India and several other countries have tax structures specifically designed to attract US tax evaders.

Hmmm. Perhaps the US could reduce its corporate tax rate in order to be competitive with the countries where tax rates are attracting businesses away from the US?

Should corporate income be taxed twice?

Only if you want to encourage it to move away from the US.

if a US-based corporation reports earnings on its income statement and enjoys the substantial benefits of being domiciled in the US

What benefits would that be? Just curious...