TL:DR: This dude was at the wrong place at the wrong time; and unless the US Government can prove otherwise, they should either release him, or if he is a terrorist, it would be a net-win if they just let him die of hunger (As their reputation w.r.t Gitmo has already been sullied).

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In a parallel universe, I claim that you are committing conspiracy to overthrow the reigning King. You say you were just walking by the forest to check out wildlife. I say nonsense; I have the power to capture you. The extent of your crime is that you were in the forest.

I then capture you and throw you in a dungeon/prison, parade you naked, urinate you, rob you of basic dignity, flog you when I have a bad day or just for my amusement. I also feed you the same bland food daily.

This is your reality [1]

I do this continuously for 20 years == 7300 days in a row. You either start growing crazy or realize it would be better to end the misery yourself. At this point you have been robbed of the aspirations you had to contribute to scientific discovery by cataloguing flora and fauna. You realize that you haven't seen your children for ~20 years. Because you have been labeled an enemy of the state, your wife was thrown out of the city limits, etc. You choose the only option that is remotely viable: deprive yourself of nutrition till you die.

I rob you of that choice. YOU DON'T HAVE ANY FUCKING CHOICE NOW. I strap you to a cot, and force feed you a disgusting liquid diet for the next N years of your life. You live like this for the rest of your life or till I decide otherwise.

Because in this scenario, I have power, I can do whatever I please in the name of protecting the life of this King.

[1] As an experiment, lock yourself in a room for a day/week with some bland nutritious food & pots & pans for bodily functions. No books, no computers, no phone or music players, or any other distractions. For added effect, wear noise canceling headphones & blindfolds. And just chill. Repeat this for a long period of time, and you'll either want to kill yourself because your existence has been reduced to nothing, or you'll go crazy. In reality you'll get pretty restless and bored within the hour.