Not particularly corrupt.
However, two decisions here identify two individuals who may be extremely corrupt. One is the decision by the prosecutor to prosecute the defendant as a juvenile instead of as an adult. I assume that at age 17, the prosecutor has discretion here. If the decision to prosecute him as a child was the result of prosecutorial discretion, then I'd suspect the prosecutor of corruption.
The other is the decision by the judge to accept the plea deal, which amounted to a couple year's probation, with the charge dismissed upon successful completion. Judges always have discretion to reject the terms of a plea deal. Ruling 78 years of prison for rape and rape-related felonies down to two years' probation + dismissal seems like a pretty corrupt ruling from a judge.
I tend towards the view that there are rape cultures and subcultures throughout western societies, but that western society as a whole is remarkably anti-rape in principles and in practice, compared to other contemporary societies and to societies throughout human history.
For example, it's pretty clear that as a subculture, the wealth-having class struggles with things like reason and accountability. This kid rapes because he can, because his money insulates him from needing a job, or having to answer to anybody as a condition of living a life of ease and amusement.
So no, I don't think we have a rape culture in our society. I do think, however, that we do have pockets of rape subculture in our society, where members have found some way to insulate themselves from our society's defining principles and practices.
I also think we're developing a pervasive gooner culture in our society, but that's a separate issue as far as I'm concerned.