Why doesn't Americans not trust the US government?
Governments are often less then candid with the goverened.
What was the position of the US government concerning the treatment of Japanese Americans during WW2?
The Japanese Americans were not imprisoned, per se. They were put into internment camps until the war was over, because the American Government didn't know if they could trust them. It was not until the war was almost over that they were freed when the Supreme Court ruled this action unconstitutional toward US citizens.
Short answer: During the Second World War, after the Japanese had attacked the United States: The American government was not sure if it could trust Japanese-Americans to be loyal to America, instead of Japan. Secret Japanese messages that American intelligence agencies secretly intercepted & decoded referred to valuable un-named Japanese agents living within the Japanese-American community (included resident-aliens & US citizens). At the time, many Japanese-Americans were unwilling to swear allegiance to the United States…