It is in interesting, and I think it's a clever trick. I think Rowling is trying to show to Harry, and to her readers, that Griffindors have as much chance as being the bullies as Slytherins do, or even Hufflepuffs or Ravenclaws. No one house is the 'house of good' or the 'house of evil'.
It then brings Harry down to earth and smacks him in the face with the Frying Pan of Reality (thank you, Tangled, for the inspiration.) I like it. :).
Personally, I see Draco and Harry as rivals more than as bully and victim. Also, while James certainly was a bully, in the books, Snape definitely wasn't helpless. He gave everything he got, hexing James at every opportunity.
And I applaud JKR for doing this because it gives everyone more than one dimension. We see that James and Sirius weren't perfect at all, which we are somewhat led to believe through Harry's idealized perceptions of them, and that Snape is multi-faceted as well. While the houses do seem a little black and white (such as all death eaters being Slytherins), this shows that being in one or the other doesn't automatically make you good or evil.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.