The notion that a fifth column had caused that was 100% wrong though - believing that it had was incredibly damaging because it gave the people who had actually failed (the ones who had ignored the British military pioneers who developed and first codified tank warfare, much of which the Germans copied) an excuse.
If t shouldn’t be forgotten either that interning those people did lead to hundreds of deaths.
I didn't say it was right; I said it was believed. Firmly. So that in mind, what nation state would not act to prevent it?
It's all about cause and effect and determining the logic of a decision. For me it's very easy to see why they did what they did and, indeed, that they'd have been bonkers not to do it.
We can look back in hindsight and say that Japanese internment did sod all but that's not the point - it's that they did it because the risk of
not doing it was perceived as being too high.
The fifth column concept now is all but a myth with the benefit of hindsight, but at the time it wasn't.