Neutrality in WWI often served the interests of belligerents rather than providing an independent shield. WWII's speed and strategic geography changed that calculation. Iceland mattered to Britain as a base for anti-submarine aircraft covering the North Atlantic gap, which made leaving it open to German occupation unacceptable. Sweden's rapid alert after Denmark's invasion is contrasted with Norwegian delay, which left fewer people ready to resist or counter local obstruction. Mobilisation also spread lawful orders widely enough that a small number of collaborators could not paralyse the defence as easily.
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Why neutrality did not protect Norway in WWII
The invasions and occupations of neutral states show why geography, mobilisation, and North Atlantic air coverage outweighed legal neutrality in WWII.