True, and isn't it funny that we're still watching those films today? I'd much rather see a movie that was made in the 40's and 50's than any of the garbage that is out there today. I can watch a movie that I've seen a dozen times and still enjoy it.
To some extent I can understand why they wouldn't do this with Arab bad guys today. Japanese-Americans (& to a lesser extent German-Americans) were treated terribly during WWII, even though the vast majority of them were loyal. The propaganda movies, and even the jokes thrown in to the cartoons, were sometimes gratuitously mean to Japanese in general. So I can understand writers & producers not wanting to seem like they're encouraging people to hate all Muslims.
OTOH, if the secular left had any sense, they would hate Islam! Islam makes Christianity look positively libertine! Christianity had its Enlightenment, where it essentially had to make its peace with reason, modern science, and moral individualism. Islam had nothing like that.
BTW, I think a big reason that Hollywood was so patriotic during WWII was that Hitler violated his secret non-agression pact with Stalin (in 1941 IIRC). When this happened, the Hollywood communists decided (or were ordered by the Kremlin) to abandon their recent indifference to fascism to become "super-patriots". After all, Hitler was now making war against "us" - meaning the communists!
But this time, the Hollywood left has decided that America - the country that had finally defeated their utopian fantasy a decade ago - was really to blame for 9/11 by being so evil. Therefore, in this war, they are not with us.