[John Isbell]

I also think publicly and conscientiously objecting to WW II would have been harder than doing so to Vietnam. Not a judgement of those wars per se, nor of the objectors, but of society's mood at the time.
Though American isolationism was going strong in 1940. I guess exact dates become important here, for both wartimes.

Update: to change the topic - reading some Hecht, whom I don't know well at all. Good stuff.