Of course he should, he broke the law and directly killed someone as a result, however, often mitigating circumstances such as level of light can play into a relatively light jail sentence due to the lack of intent. If he had delibrtely run someone over totally different story.
Additionally, he should have been arrested anyway, drunk driving is illegal just because of the increased chance of hurting someone.
However, you drive along and someone delibrately jumps out in front of you too fast for you to stop with the intention of dieing, or even just because they're an idiot, is it your fault and should you be arrested? Of course not.
Even if we pick a vehicular situation which is remotely similar to the one in question, swerving towards someone with the intent to scare them, followed by accidently hitting and killing them, then the punishment is still only triggered by the fact that the driver was breaking the law with dangerious driving in the first place. The punishment could be harder due to the fact that someone died, but it still doesn't change the fact that the driver was, in the first place, doing somthing that should have gotten them arrested anyway.
People have killed themselves over debt, should the banks be responsible?
People have killed themselves over being left by a spouce, is the spouce responsible?
People have died in wars, should the recrutment agencies be responsible?
Even ignoring all of this, you havn't even read the article fully. 'The next day more messages appeared from Josh and other people.' 'Megan said she felt like she was under attack from everyone, even from Tina, who was furious her daughter did not do as she was told.'
Did this girl kill herself because of one single person? Should the mother also be responsible?