Because sadly the scumbag was convicted of death by dangerous driving, which still (and it needs to be harsher) is a lower sentence than murder or even manslaughter, because you can be convicted of it if your actions were stupid and/or negligent, but not deliberate. IE you took your eyes off the road to adjust a car radio, look at your mobile.
Years ago in WA this woman was changing CD’s while driving. Took out three kids (killed). Got something like 4 years in Purdy (women’s prison). For whatever reason the governor paroled her after two. BTW - a republican one, but then there’s Huckabee releasing that murderer to come to WA and killed four LEO’s.