Why would any President publicly call into question wartime strategies of a war that ended 60 years ago, a world-wide conflagration that we won in just four years, by the way? How do you argue with such enormous success? If he would have questioned Patton, MacArthur and Eisenhower, one wonders how many good generals may have been ignored in this war as well, including General Colin Powell? I honestly feel insulted by what he said, and I stand by my country's WWII record 100%.
Oh well, when Hitler's unsurpassed military juggernaut and Hirohitos fanatic warriors are not killing millions of your and your allies' best men, and when 1/3rd of your Navy is not resting on the bottom of the sea at Pearl Harbor, and 70,000 of your troops have not been captured in the South Pacific, I suppose it's quite easy to make such a proud, ignorant remark.
All that aside, I'm sure you would freely question the pre-war strategies and decisions of all of the Allies, with regard to both Japan and Germany; and I'm sure you would freely question the post-war strategies and decisions of several presidents, with respect to Red China and the USSR.
What is it, specifically, about this one comment that has got you so upset?