This Is Just Me Trying To Make Sense Of How The Chapter Title Of 139 Is Connected To The Extra Pages

Alright this is quite late, but I think the question was referring more to the nature of the freedom Eren seeks than the root of the desire. We know he wipes out the rest of the world for "freedom" but is it freedom in the sense that the world is hostile and he's trying to preserve himself through aggression or is it because the mere existence of humans "taints" the pure scenery he saw in Armin's book and imagined as freedom.

Of course, it could be more nuanced than that, but the words Eren says seem to give credence to the latter interpretation though it doesn't sit well with me.

What is your genuine interpretation of the type of freedom that Eren desires? Does he desire freedom because he was born into this world, or is it because of Armin’s book? 131 seems to establish that it was because of the book, but the paths chapters focus on Eren’s philosophy of “being born into this world.” Which do you believe he valued more?

Both. Eren is implied to have had a subconscious reaction to his father's sentiment at his birth, but it was only brought into consciousness when Armin showed him the book. That's why Eren was so listless beforehand: his primal life-urge was going unrecognised and unsatisfied.

There's also the factors of the Founding and Attack Titans working outside of time. Eren's future personality likely influenced his infant self, as well as the nature of the Attack Titan to always strive for freedom.

Akşam üstleri, gün batımları neden hem güzel hem kederlidir usta?”

Murathan Mungan...

“So long as man remains free he strives for nothing so incessantly and so painfully as to find someone to worship.”

— Fyodor Dostoyevsky, The Brothers Karamazov

Eren’s Path

I just noticed the parallel between these scenes.

When faced with an outcome as horrible as the Rumbling, most other characters try to think back to a point where they could have gone down a different path or where the trouble originated from. Eren even briefly does this.

But he not only refuses to consider other possibilities, he even rejects the utility of retrospecting in the first place. To Eren, the Rumbling happening is not a problem of the right choice or the circumstances that shaped it, it's just about who he is and his "primitive desire".

So I guess in Eren's mind, the Rumbling was an existential dilemma. So long as he exists he will surely bring ruin to the world, so is it better to never have been born? Or take away his life? He couldn't possibly do so after Historia and Carla's lessons.

So he tried to change the world by facing judgement through death for his actions, or as @jeanandthedreamofhorses said, he tried to use this inherent ‘evil’ to make the world better, by gearing his desires towards their own self destruction.

But it seems to me that a curse, no matter the good brought about by it, remains a curse, 80% percent of humanity is too great a price to pay for the end that was reached, but Eren and the Alliance were at least able to prevent total extinction, and no matter when, Eren was able to temper his desires. So he may have brought about a great amount of suffering, but his final acts contain seeds of good in them.

In my end is my beginning.

T.S. Eliot, from Four Quartets; East Coker. (via xshayarsha)

the most beautiful scene… their smiles made my heart skip a beat

Ah yes, my favorite genre...

What might have been and what has been Point to one end, which is always present. Footfalls echo in the memory Down the passage which we did not take Towards the door we never opened Into the rose-garden. My words echo Thus, in your mind.

T.S. Eliot, from section I of “Burnt Norton,” Four Quartets (Mariner Books, 1968)

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