For your clarification, the Hawaiian Nation did not seek international recognition through the world court.  First, it's not within the jurisdiction of the world court to recognize the sovereignty of States.  Second, Hawai'i is not a recognized State that is also a member of the United Nations, and would therefore not be able to bring a claim before the International Court of Justice (aka "world court").  

Next, Congress has no authority to grant independence to a group seeking independence. This would be akin to saying the French government gave the Thirteen Colonies independence. 

Yes, the land here in Hawai'i is sacred to a great many Hawaiians.  Yes, Mauna Kea and Haleakala are sacred to a great many Hawaiians.  The sacredness of these places were documented long before the United States was ever a country.   

These "activists" are standing up for what they believe in.  Making trouble is going to a public forum and spreading misinformation about something you clearly don't know.