The choice made by the German Chancellor cannot be simply labeled as right or wrong.
But history is often filled with such coincidences. It just so happened that the British and French forces were at their most critical moment, with the French defenders in Lille already at the brink of existence, unable to hold out for many more days.
If the armored troops had not been withdrawn, although they might have sustained greater losses, it was very possible that they could complete their planned offensive and prevent the British and French forces from evacuating from Dunkirk.
Yet the Germans did withdraw their armored troops, which gave the British and French forces on the entire front line a huge sigh of relief.
Although the Air Force was also bombing Dunkirk constantly, such bombing was destined not to be maintained all day; there were inevitably breaks at night.