Shutter Island's Plot Made Me shutter

Spoiler Warning! Spoiler Warning! This post is about the wild and un-realistic plot of the Scorsese film Shutter Island. Those who haven't seen it and want to know the idiotic twist ahead of time, proceed. Those who have listened to their Shutter Island loving friends and buy into the radical psychological twist and turny, edge of your seat, thrill ride and want to maintain a sense of wonder when watching, stop right now.

Shutter Island - I won't get into the amazing look and feel of the film. Scorsese does a great job putting all the pieces together to make an immersing thriller. But when you have a film where the audience is just waiting for the Hitchcock reveal the whole time, it doesn't matter. The whole film, we just kept hoping that it wasn't a dream, or that he's really a patient. It had to be better than that, this was Scorsese. Then the government conspiracy plot started to unfold and it seemed like the whole movie was going that way, to the "it's all such a huge secret cover up", reaching the highest levels of government.
That would have been interesting. But still, we hoped for something even twistier, darker or something that hasn't been done.
In truth, part of the actual reveal was darker. In fact, the real story is pretty messed up, his crazy wife drowns their kids and he's so guilt-ridden that he caused his own kid's death, his mind covers it up with a new story. But wait, is everyone else at the institution as insane as he is? Yes. They've been letting the "most dangerous patient" on the island have free reign in the most "elaborate role play" ever conceived. All in an attempt to wake up DiCaprio, or the "board" is going to have him lobotomized.
Movies always tackle plots from the back angle, telling us it was all a rouse AFTER the fact, hoping that since the audience has invested so much into the movie that we'll buy into it. Movies never start the story from the beginning of the rouse. Why? Because we'd walk out/turn off the TV because it's retarded. We'd see right through it.
So, let's re-inact the most elaborate role play from the beginning to see if what the head doctor is doing could be considered logical.
Andrew Laeddis arrives on the island and becomes the most dangerous patient because he hurts the staff, is violent, and is completely delusional(pretending to be a US Marshall on the island). Dr. Cawley (Ben Kingsley) decides, after attempts at permanently awakening Andrew to the truth have failed, that the only way to do that is to let Andrew loose on the island, pretending to be a US Marshall investigating a case. He and the staff act as if there is a patient missing, and they even let him interview some patients, who are given coached answers. I guess they knew what he was going to ask? Then, somehow they engineer a way for him to get to the lighthouse and learn everything. So along the way, how was Andrew supposed to figure out the real truth, when they're all lieing about the missing patient? He isn't, the only way that he figures it out is when Ben Kingsley just outright tells him the whole truth in the lighthouse. And even then, it takes a while to sink in.
So it begs the question....if the board was going to lobotomize this guy for being "the most dangerous patient" on the island, why would they let him loose on the island? Does Dr. Cawley have a Murder Mystery Theatre background? Because he's pretty creative. Pretty damned creative.