What is "this"? You need to be a bit more specific. If you're referring to our debate, it's not supposed to prove anything. The water spray idea while a good idea but doubtful that it will be implemented.
Now back to the quote and subsequent picture. How many times do you think the Luftwaffe sent up it's fighters after a bomber stream? Maybe once or twice per jadgeschwader. Once going into the target and maybe, and that's a big maybe, once on the way out from the target depending on location and altitude of the bomber formation. A 1960's book written by one pilot with an account by one tail gunner can not, and does not speak for the whole of the heavy bomber force in WWII.
The pictures you post are not indicative of the quote you use. the top one is of a 91st bomb group aircraft and had been named bombboogie. The second aircraft you show is indeed from North Afrika and was hit by a Bf109F-4 trop, literally. The pilot crashed his 109 into the 17 after a misjudged gunnery run. It was not caused by gunfire nor by AAA.
Now this image is of WeeWillie going to her demise after a direct AAA hit over Stendahl on April 8, 1945. WeeWillie was Boeing B-17G s/n 42-31333 coded LG*W and flew over 135 missions over Hitlers Germany. She belonged to the 91st Bombardment Group (H) 322nd Bombardment Squadron, Bassingbourn, England. This photo has been misinterpreted as having been hit by a 262 but eye witnesses state a direct hit from flak tore her wing off. She was the second to last fort lost by the 91st before the end of the war. Nine crew were on board, all nine perished and are interred in Holland and can be visited this day should you desire.