Missed the question, its not lack of law enforcement on the island, its at the mainland launch. Thats where the carnage occourred .
Humans are an interesting critter; when they find something they love, they very quickly move to love it death...and it's always the result of someone else's actions when retrospectively analzed from 5,000 feet.
You missed one key point in your second person rendition. The mainland launches are both PRIVATE facilities. Correct? Thanks for incrementally nudging them toward closure to the public or invitation to use only. The guys who worked to get them opened for public access via a launch fee are long dead, so who cares about their legacy. Julus and Martin are basically the last of the old guard still alive who fish there. The guys you mention are best kept at arms length. Over the years they never have engaged me. I extend them the same curtousy, not folks I would seek-out as freinds or enemies. I know a bit more of their backstory than you...which is odd, because it is a matter of public record via court documents and received extensive media coverage at the time. The sport hunter at the center of the controversy has a pretty convoluted backstory as well. Who woulda thunk that they would interact to create a unpleasant result and future outcome?
In a left-handed way, what you sketch out reads very much like a specific localized effort to practice QDM principles to manage deer on acreage the SOM has basically designated as a make no effort to manage timber resources on their acreage due to the cost of enacting and directing any cuts for hardwoods or cedar. Get a larger proportion of the deer older to survive winter by managing for older bucks and a stable social heirarchy for both sexes. John Ozoga wrote an interest piece titled:
In Search of Monarchs in a sportsman's publication that used to exist here in the Upper Peninsula. He essentially outlined sound population biology management principles and approaches and then compared them with parallels within what QDM proponents advocated- very broad overlap with the central focus on what he often referred to as restoring and managing 'the Green Barns' also referred to as deer yards in that era. Now they are DWCs. John's focus and emphasis wasn't on large racked bucks dominating a herd structure, he was arguing that having a large(r) cohort of deer that were sexually mature and older limited the impacts of long severe winters or those that linge well into spring on overwinter mortality. He is very fond of repeating that it takes a lot of effort to starve an adult deer to death.
We have just come through a deer season that underscores the broad benefits of that approach. What if, sport hunters engaged and supported the same or a broadly similar approach to mainland deer management? Why would this not generate similar results...? Sure couldn't be lack of concensus and adherence among them. How is this broadly different from the events you outline, just more violently enforced?
Much of the island is exposed dolomite limestone as well as all of the shoreline. I used to over-night freqently in the harbor-of-refuge which is surrounded by private land onshore when I fished out of my Conquest 235 when fishing down there. Did the same thing at St. Martins until I sold the boat when the salmon fishery declined to its ebb. No one destroyed my vehicle on the mainland or my trailer even though I came onshore on occasion. My principal effort was to avoid the summer drunks salmon fishers. I know the MDNR forestry technician that did the last SOM forest inventory down there on both Big and Little Summer through fishing in Maaistique, his home port. He is also an avid deer hunter. We compared notes on estimated deer density. Big Summer has roughly six square miles surface area. We both set deer density per square mile at 12-15 animals. Time has passed since 2012 when the forest compartment management document was written. With no cutting on the roughly 1,300 acres of public lands, I doubt if deer numbers have improved, more likely outcome based on seral stage progression rates. If you apply the upper bound deer density, you arrive at a total population of around 90 deer with an unknown sex ratio. That sure ain't a trophy buck behind every tree, or even every twelve trees... Yes, if the hunter population is low, around roughly a half dozen, older larger deer get shot more frequently.
Pretty reminiscent of what happened on St.Matin Island as well...