Why so unserious?

In Red Eye, Melanie Zanona writes about a recent series of street attacks in Chicago:

While none of the victims were seriously injured — the Michigan man suffered a broken jaw and the Gold Coast man suffered lacerations and bruises to his head and body — the attacks have once again raised concerns among Chicagoans and tourists on how to protect themselves.

Hmm. If my jaw were broken, I’m pretty sure I’d consider it a serious injury.