Chris.
Why do you dismiss without mention the information supplied in the Daily Mail by Mike Brady and Lawrence Watkins, that the school had been used by the Ministry of War, and that the pilot made two approaches to ensure hitting the school.
These should be added to the information given by Brian Bines above that Schumann is on the record boasting that only targets were hit. For Schumann, therefore, the school was not the collateral damage which you categorically say it was.
"My father, Eric Brady, who was interviewed for this article, has researched the background to the attack in detail and catalogued the sequence of events that led to just one of the six schools targeted being hit. As he mentions, the schools had been used while the children were evacuated by the Ministry of War - and by coincidence my grandfather was a despatch rider during the war and delivered documents to Sandhurst Road School during this time. My father, like many other children, had only just been recalled from evacuation in Wales a matter of months before their reopened school was bombed." - Mike Brady
"My mother i (sic) remember telling me that the aircraft made a roof top high first run and she could clearly see the pilot, the second run dropped the bomb. He also returned and straiffed (sic) the play ground." - Lawrence Watkins
Tony