I usually take a dim view of lawsuits like this. Especially when distraught parents are looking for anyone to blame, and anyone to sue.
But this looks like a reasonable and proper case. A large company that had resources to test properly released broken code that put public safety at risk. If nothing bad had happen they would have argued "no harm, no foul". But something bad did happen. A child died. The expensive system set up to prevent this tragedy was disabled. That failure should have a cost. A high cost. One that makes companies behave responsibly. Even if they wouldn't act morally of their own profit-driven volition, the bean-counters should point out the potential cost in dollars.