All this "X deserves Y" stuff is nonsense.
Ishigami tried white-knighting. He got played. His life got ruined.
He has since been helped out and is getting things back on track, but that doesn't change the fact that all this happened to him in retaliation for his meddling. He shielded a stupid girl from the consequences of HER bad choices at the expense of his own life... which was idiotic.
At least he owned his choice, I suppose. If he had actually apologised, that would have been the lowest of the low.
And I'm sure it nets him plenty of points with little miss Justice.
He really should have just minded his own business in the first place... but what is done is done, and there is no taking it back.