Answer: because that's not how the Environmental Review Process Works. Superferry was only supposed to do it because they were making modifications to State property. Then opponents, many of whom know little about the process, twisted it to try to get an Environmental Impact Statement for all the potential impacts of the superferry unrelated to harbor improvements. Thank god they did though; Hopefully it will spark some mitigation to real modern-day risks associated with the interisland ferry.REMINDER OF THE DAY: Matson brought the invasive and extremely loud and noisy coqui frogs to the islands from the mainland.
Why doesn't Matson be subjected to an EAS just like the SuperFerry
Answer: Because Matson is one of the monopolistic companies that donates generously to the regime in return they are protected from competition and don't have to comply with environmental laws.
I'm sure matson and young brother have done many Environmental Assessments or even EISs in the past but probably not for the reasons people seem to expect. You do not need to write an EA or EIS if you are using harbors, despite your negative impacts, even though they would benefit the environment in many cases.
Had HI super ferry not tried to sidestep the process, in order to save some $, they would have gave less ammo to their opponents. They probably would have succeeded in their business, the the benefit and detriment of all us neighbor-islanders.