Then why do you choose to be a member of what you regard as evil. You ought to be ashamed, but even better, you ought to choose to be an independent individual that does belong to or support any collective. So long as you do not choose to think for yourself and make yourself what you ought to be, and find your identity in some collective--society, or ideology, or country, or community, you will always have to be ashamed of what the ignorant masses you identify yourself with do.
Who do you think the, "America," that, perpetrates the atrocities you decry Is? It's not all the independent individuals who have no use for your government or society, it is you and all those others who believe in some social/political solution to human problems. It is not individual people who happen to live in the United States that support the American government's military adventurism, its all the individuals who identify themselves, "we," when talking about American.
One of the wonderful things about being an independent individual is never feeling any guilt or regret for the horrible things any government does, because they support no government and have no part in any collective society that does.