Shutter Island

I am using 'Shutter Island' (Dir. Martin Scorsese) as one of my influences for my film project, and I am especially taking a look at the end scene. The reason for why I am looking at this scene in particular, is because it follows one of the main conventions of the psychological thriller which is the 'twist' for the protagonist. In 'Shutter Island', US Marshall "Teddy" Daniels (Leonardo DiCaprio) is investigating the case of a missing person, Rachel Solando, on the Ashecliffe Hospital for the criminally insane on Shutter Island, he goes on to discover that he is in fact Andrew Laeddis and that he killed his wife after she drowned her children. Also that Edward Daniels is in fact an anagram of Andrew Laeddis, and that he is the most dangerous patient on the island and that they are trying to 'cure' him and this is the last attempt and doing so before they perform a lobotomy. The film ends were it seems that Laeddis has regressed back to the character of "Teddy" Daniels but before he is taken away for the lobotomy he says it would be worse to 'live as a monster, or die as a good man'.