Conversation so far:
What started the Sweden Midsummer crisis of 1941?
The King threatened to abdicate if the Government did not approve a German request to transfer a fighting infantry division through Swedish territory.
What was the outcome of the Midsummer Crisis of 1941?
The German troops were allowed safe passage through Sweden.

Question: Why was this agreed upon?
Self-contained rewrite: Why was the passage of German troops through Sweden agreed upon?