The 1st world war cannot be used as an argument to support the 1914 prophecy, for the simple fact that it started too early. The 2520 years ended in october/november 1914, whereas the war had already begun in June. Satan and his hordes were only thrown out of heaven AFTER the start of the kingdom (autumn 1914).
About the socalled good attitude of the Bible students back in the day, it is good to remember that Russel sold "miracle wheat" for an enormous price. Furthermore the colpolters of the day were there to "sell" the volumes of studies in the scriptures, even if the very same volume with a different name was already in the household. If JW of today would hold on to the attitude and teachings of 1919, they would be disfellowshipped.
Examining the details of what the society published just before and after 1919, proves there was no selection at all going on. Actually this was proven by the fact that 10 years later, the Bible students under Rutherford had halved in number. If there would be some kind of blessing by Holy Spirit, you would expect an opposite result.
Hoffnung