I'm theory I like this idea, make the person that killed the parent and remove that support try to replace it. I just don't know how well it's going to work in practice. Like, I don't know how many drunk drivers have a high enough income that any meaningful amount of child support would be derived from this. Not that a drunk driver being poor or not should get them out of consequences. But like my dad weaseled his child support payments down to $25 a month and it was just ridiculous. It didn't help at all. But some nice karma on him was that all those years of working under the table to lower his child support meant that when the piece of shit got injured and needed to try to get disability he hadn't gotten enough work credits in the previous ten years.
I feel like it would probably be better if the state established a fund that they could use to pay out to those kids that they could fund at least partially with fines brought against drivers convicted of DUI. That way we could guarantee some level of support for the kids that lost parents and still force the drunk drivers to at least partially fund it but a kid won't get screwed just because the drunk driver that killed their parent particularly happened to be poor.