Curfew??
Chaparones??
Rules & Boundaries??
Where were these??
IMHO, this is a failure of the team's parents and supervisor to set forth their expectations and consequences.
Hey, life's tough. It sucks they were shown the door in the middle of the night, but those concerned should have issues with the kids that fought & the parents that tacitly allowed it through their failure to supervise the kids properly.
I'll probably get flamed for using my broad paint brush again, but oh well, here goes.....
I lived in Hawaii for 3 years, and then moved straight to the Baltmoire/DC Suburbs, and have been here for almost 3 years. Both Hawaii and Baltimore have high levels of poverty and atrocious schools. I knew of several parents in Hawaii who sent their kids back to the mainland to live with relatives b/c attending school there (even private, IF they could afford it) was so detrimental to their educations. Reading levels of Hawaiian students are consistently a few years behind those of average mainland schools... Also, one thing I will always remember about Hawaii is going to the Wal-Mart in Waipahu and noticing the kids that just run free, all over the store! You could walk in at 2 am any day of the week, (and we frequently did) and the place would be PACKED, and there would
still be kids running around like chickens with their heads cut off!! You just got used to kids bumping into you while you shopped.

The culture there is very different from "mainstream" culture. A vast majority of natives don't really push their kids to get an education, and there is a lot of gang issues with the "kids". My SGT had a lot of issues with her kids b/c they were black and went to a school in Waianae (HUGE native population, DO NOT like Haoles, [what they called us white folks] infringing on their turf); they were frequently harrassed and
beat up and teased about being black. She got absolutely no help from the local school board or police. She ended up sending them to live with her family back on the mainland for the remainder of her time on island. It doesn't surprise me at all that there were Hawaiian kids who were unsupervised, or that they got into a violent fight, OR that the parents are placing the blame on others.
Inner City Baltimore is the same way and is known for having horrible crime levels. They also have huge issues with gangs and gang violence. It also doesn't surprise me, one bit, that kids from Baltimore were unsupervised, or got into a violent fight.
I am assuming, that the reason Disney took such drastic measures is b/c the fight was pretty violent and included many kids. I wouldn't be surprised if it was reported as "gang-like" violence. I wouldn't want anything resembling gang violence on my property, around families and young children for more than 30 minutes either.

If you don't want to be ostracized, treated badly, or "discriminated" against; well, stop being a crappy parent and raise your kids up right.
Again, just the first thought that popped into my head, b/c of my experience with living in both areas....