History and culture, I agree. And don't forget geography.
Island chain. The wide open spaces of the frontier, whether you are talking the US west or earlier when the frontier was Kentucky, simply don't exist. Their frontier was the sea, where guns are not particularly useful.
Correct me if I'm wrong, but I don't think that there are any large predatory land animals native to Hawaii. No mountain lions, bears or wolves to eat you, or your stock.
So, the usefulness of firearms was not a cultural thing, the way it was with "mainlanders".
I would think that when the politicians instituted restrictive gun control, the majority of the population literally could have cared less. Not something most had ever been exposed to, didn't grow up with, and weren't interested in, so they didn't fight it much, if any.
Possibly the native islanders considered it a white man's thing, and didn't care to be involved.
And you know, the only reason the Japanese attacked Pearl Harbor was because that's where the US Navy was! etc.