He was prosecuted for his driving, not the actual effects of that driving
going back up the thread a bit, but this is a bit that annoys me. (not you, poster, but the principle)
This is where drivers get the best of both worlds. Sentencing is made up of culpability (how much of a dick were you), aggravation (how hard were you trying to be a dick) and mitigation (can you claim something made you a dick, or, did you do your best to be less of a dick after the incident?). And all within the context of sentencing guidelines.
Neither the impact nor the potential of the offence is explicitly taken into account in the sanction.
BUT we see criminally bad driving EVERYDAY, yet even if there is a prosecution, if no one is maimed or killed the sanction is at the lower end regardless of whether you could have easily killed someone.
So if you drive like a dick and dont kill anyone, you get done for driving like a dick. If you drive like a dick and then kill someone, you still just get done for driving like a dick rather than having the gearbox of a transit van shoved up your arse.