So, you're arguing the majority of companies over, say, a $50 billion market valuation in the US are hiding all their profit in the Caribbean and none or very little of it is reaching the US tax system.
Conveniently, a few minutes going through public financial statements disproves that outlandish, comical premise.
3M, McDonald's, Wells Fargo, Citigroup, Bank of America, AT&T, Delta, UPS, Disney, Pepsi, Coca Cola, Honeywell, Intel, Walgreens, Goldman Sachs, Walmart, Boeing, Visa, Comcast, Altria, Exxon, Chevron, Nike, Honeywell, Intel, Merck, Pfizer, Cisco, Oracle, Procter & Gamble, Caterpillar, etc.
They're all going to be very upset to discover the 20-35% tax rates they've been paying on their earnings, they could easily have avoided by just squirreling it away in the Caribbean.
One could also do a few minutes of research:
"The average effective tax rate among S&P companies that had posted calendar fourth-quarter results as of Friday was 24.11 percent"
https://www.cnbc.com/2017/02/13/tax-cuts-sp-500-may-not-get-...