America doesn't even have so low a tax regime when you include state payroll and sales taxes - they just have a low federal tax rate, which is often incorrectly compared directly to income tax. At least, the tax regime is not particularly forgiving to the working man - they have this fantastic concept called 'supply side economics' which (for example) drives the republicans to abolish inheritance tax altogether even when an exemption of $100 million was suggested in congress - seriously, $100million! They are happy though, because jesus votes republican, amen.
But of course yes american services suck, the schools are all governed by toothless hillbillies and the hospitals will let you burn to death right in the waiting room if you can't pay for the fire extinguisher. And still they have the largest budget deficit in history