I attribute the range rules are for political correctness, location, lack of funding, and it being a public range. The no human shaped targets are to assure the range isn't creating murders. KHSC is in a bad location with housing developments in the impact area whereas mainland ranges are usually in remote locations with lots of empty land all around. The reason the range has a lot of limitations like the 5 round mag limit, 100 yard max range, no rapid fire, etc. A lot of these limitations can be overcome by improvements like better berms, baffles, training, more RSO's, etc but there is no funding and since it's a public range, no political will.
On the bright side, public shooting ranges are a rarity on the mainland. One that doesn't charge a fee and has the different types of shooting sports in one place with regular hours is unique. KHSC might be the only one of it's kind in the nation.