I fail to see how your proposal constitutes justice. Neville gets bullied by Slytherins. Lesath gets bullied by Gryffindors. These two facts do not cancel each other out; they just make the world a worse place twice over.

It does seem rather asymmetric, doesn't it?

Some Gryffindor kid cheers for the deaths of the Death Eaters, and he is assaulted and officially punished, while just prior, the younger Jurgson is cheering on the Dark Lord coming back and ... he receives compassion.

I wasn't offended with McGonagall offering support to the orphaned children. But an under age ID shouldn't be a get out of moral responsibility card either. Hogwarts goes up to 16? 17? That's old enough to be held responsible for your loyalties.

I sympathize, but... 1) McGonagall has grown since the Roles arc, and is more likely to think about the consequences of her actions, now. 2) She is more maternal than Dumbledore was, he wouldn't have necessarily thought that way and he was in charge after the first dark war 3) Time - it is much more obvious to McGonagall how the newly-orphaned students will react and will be treated, then it would have been for her to realize how much of a target Neville was 4) Similarly, the likely treatment of death eater orphans is probably much more physically severe than what Neville goes/went through 5) Up until the Self Actualization arc, Hogwarts did not take bullying seriously. Many real-world schools still don't