We don't know, for sure, what happened. There might be some creative license in the journalism. There might be some omission of them talking to authorities (even if someone called the highway patrol and they said "oh, we don't know about this," all it proves is there's bureaucracy at the highway patrol). etc.
Calling the cops is invoking a powerful and hard-to-control force. Unless you think that the cops and the legal system are capable of talking to people fairly and understanding security research and making sense of tech journalism and reaching a reliably just outcome, there are better ways to exert your outrage.
For instance, the researchers are very well known in the security community. They're not rogues or mobsters or fugitives. If they recklessly endangered lives, we can pressure them to turn themselves in to the legal system.
I happen to have more faith in the ability of the hacker community to fairly figure out what happened than the legal system to fairly figure out what happened. If I shouldn't, then we have a serious problem as a community.