If USA is the best country in the world then how come many American don't have Health Insurance?

Also our tax rate isn't that much higher than the Europeans if any, especially for the middle-income. But at least the Europeans provide national health insurance even to the homeless. In England they don't tax food to go or clothings. So why do I hear from some of the ignorant Americans saying this is the greatest country?
--------------------
The US isn't the ''best country in the world,'' it's actually turned in to a police state.
Source