Stein is wrong on them defending the Constitution.
Under FDR, delusions aside, they were defending the government, the territory, and themselves ... but FDR had cast aside the Constitution and governance by constitutional means for governance according to what those who govern think government should be able to do.
Eisenhower COULD have chosen to restore governance by constitutional means but he didn’t. He didn’t even try to get the ball rolling on amendments to make FDR’s high handed lawlessness lawful. He was fine with Arbitrary government as achieved so far even if he sought to slow or stall more lawlessness on top of that and in being so was the precursor of the ever more useless Republicans whose only advantage is that they don’t suck as hard as the (ever eager to expand lawlessness) Democrats.
In my opinion the real mistake FDR and his buddies made is the underlying assumption that gummint could be a force for good. Never has been, never will be. The one tool gummint has the franchise on is violence. It is like trying to put a shine on feces. It can’t be done.