The short prison sentence doesn't bother me. Prisons are a social poison that we should be doing away with for all but readily and immediately violent individuals.

What fucks me up is that he's getting his keys handed back in six months. He's getting quick and untested access right back to the large machine that he already demonstrated he is mortally dangerous when operating. Doesn't sound like they're even going to test him on correct use. That thing you just killed several people and maimed dozens others while operating? Welcome back buddy, do it again.

IMO he should be doing several years of community service, primarily as restorative repentance in the community where the crimes took place, and having his license revoked for at least five years. Getting it back should require a higher barrier of testing than the default. Put a black box in that car and have it report everything for the first year.