There is a difference between responsible criticism that aims for success and defeatism that refuses to acknowledge anything but failure. Hindsight alone is not wisdom, and second-guessing is not a strategy.
I lose my patience, and I own it too,
When works are censur'd, not as bad but new;
While if our Elders break all reason's laws,
These fools demand not pardon but Applause.
To announce there must be no criticism of the president or that we are to stand with the president, right or wrong, is not only unpatriotic and servile, but is morally treasonable to the American public.