I would rather the movie be based off of the book Brutal, instead of Black Mass which although is decent, it does not seem very objective. That being said, I'm glad it's Depp playing him, not Damon of Whalberg or some other clown. Not sure I agree with your opinion on Black Mass. If anything, I would be least likely to believe everything Kevin Squeeks says.
" No matter how big a guy might be, Nicky would take take him on. You beat Nicky with fists, he comes back with a bat. You beat him with a knife, he comes back with a gun. And if you beat him with a gun, you better kill him, because he'll keep coming back and back, until one of you is dead! "
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