Its only a problem for people that choose to make it one. However, there is nothing racist about the comments you quoted.
Racism by definition is:
1) A belief in or doctrine asserting racial differences in character, intelligence, etc. and the superiority of one race over another or others; racist doctrine also, typically, seeks to maintain the supposed purity of a race or the races. 2) Any program or practice of racial discrimination, segregation, etc., specifically, such a program or practice that upholds the political or economic domination of one race over another or others. 3) Feelings or actions of hatred and bigotry toward a person or persons because of their race.
You might be able to make an argument that they are prejudice, but even that is debatable. Seeing how neither of the comments displayed hatred against another groups or race of people. Expressing an opinion is not hate speech.
Prejudice by definition is:
1) A judgment or opinion formed before the facts are known; preconceived idea, favorable or, more usually, unfavorable. 2) a) a judgment or opinion held in disregard of facts that contradicts it; unreasonable bias [a prejudice against modern art] b) the holding of such judgments or opinions. 3) Suspicion, intolerance, or irrational hatred of other races, creeds, regions, occupations, etc. 4) injury or harm resulting as from some judgment or action of another or others.
The above definitions are from Websters New World: College Dictionary Fourth Edition.
If you are referring to people that lost their lives in early America, then I would suggest that you thoroughly research the topics of how America was established, how slaves came to America and which countries brought them here, how white people were slaves and indentured servants and how white people had it just as bad in the south if not worse after the America Revolutionary War leading up to the great depression. Then I would suggest that you research the progressive era.
To categorize America as being this or that is to ignore history and to let it speak for itself.If you still want to have a conversation about racism or prejudice, them I'm sure anyone will be more than happy to have that conversation with you, but the comments you posted are far from being racist.
More disturbing is the recent news about Alan Turning being chemically castrated for being a homosexual.
Queen pardons Alan Turing, code-breaker castrated for homosexuality - CNN.com
I know what you mean and it is quite clear. You want to blame white people that live in America for the woes of the world. America isn't a country based on any one particular race, nor is America identified by any one particular race or ethnicity. It is a nation of many nationalities and faiths, built on the ideology of freedom and liberty from tyranny of oppressive rule.
Anyone that lives in America regardless of their skin color, religion, sexual orientation, age, social status, income, etc. is an American first and foremost. There is no such thing as un-American unless you are somehow against freedom. I could be against certain things in the constitution, but that doesnt make me un-American. The constitution is a living and growing document that changes from generation to generation. What was acceptable a 100 years ago may no longer be acceptable today and things in a republic, or democratic society are likely to change.
When you say, America is ethnocentric the first thing that comes to mind is that you think all white people are racist and dont accept diversity or cultural differences. People that live in America are Americans first and their culture, religion, etc. comes second. It is a nation for the people, by the people.