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If the purpose of putting a felon in a US prison is to rehabilitate them, then it's reasonable to argue that Marcus has already rehabilitated himself, before he travelled to the US and got arrested - he'd gone from being a 14 year old kid interested in malware to a responsible malware researcher interested in saving the NHS from meltdown. To me this is a lot like Alan Turing saving the UK from Hitler and then being prosecuted and persecuted for being an illegal homosexual in Wilmslow, UK in 1954.