With respect to the question you raise, if you are specifically singling out Hawaii Democrats, you need to go back in history, before those Democrats came into power.
When the Hawaiian Kingdom was illegally overthrown and illegally annexed by the US, it was the White Republican racist minority that only wanted to remain a territory and never to become an official state, of the US empire. Why? They knew, if Hawaii became an official state, they would lose their almost unilateral political power, as Hawaiian nationals would be afforded US Constitutional protections, particularly the vote. With the aboriginal Hawaiians being the majority population in Hawaii, at that time, the White Republican racist minority was not about to lose their dominant status because of the personal liberties afforded by the US Constitution.
Now then, to answer the question regarding the overbearing laws preventing the 2nd Amendment in Hawaii, you need to realize what ethnic population(s) led the way into becoming an official state, of the US empire. I can assure you, it was not the aboriginal Hawaiians that wanted to trade White Republican racist rule, just for non-White ethnic Democrats, to take their place. Suffice-to-say, although the newly empowered non-White Democrats were viewed in a much better light than the recently overthrown White Republican racists, the new Power Okole knew aboriginal Hawaiians would one day rise and work for the de-occupation of their nation and that was something obviously not acceptable to them. Hence, it should come to no surprise that same Power Okole would be very restrictive to the 2nd Amendment moving forward, in case of such eventuality.
Ironically, seeing how the unpredicted, unforeseen, and abrupt de-occupation of Afghanistan unfolded, after 20 years of US puppet government rule, you could say the current local US imperial government operating in Hawaii has reason to be concerned.
