This is the United States of America, not Vietnam. I wouldn’t expect Vietnam to fly our flag. Your analogy makes no sense to me. The Vietnam Memorial is for US soldiers, not Vietnamese. Not the same thing at all.
If you will re-read my post, I refer to the Vietnam Memorial in Washington. And I inquired about your views of flying a flag in honor of a lost cause - the Vietnam War.
Earlier, you had suggested it was wrong to fly a flag in honor of a lost cause. You have backed off your ill-considered remarks about lost wars and the comparison of Southerners with Nazis. There is no need to further punish yourself.