A Black Hole In My Head

Imagine an alternate universe where, instead of exploring outside the walls, the Survey Corps explore space for extraterrestrial life, the same way we do in reality, but when they find life, all they find are other humans. But humans which are nearly unrecognisable to them, since they've adapted to a completely different environment.

Like in the past, humanity had originated from Earth and they had advanced so thoroughly in technology that they were able to go inhabit other planets, but they only had to because humanity's current practices are destroying Earth. Likely, the resources were dwindling, and they had to escape 'quickly,' or relatively quickly in when speaking in terms of the way the environment dies very slowly, but there was/were only one or two other planets that were relatively habitable for them, and it was at least a light-year away, so they could only host a select number of people on their spacecraft to get to that planet, with respect to the supplies needed to be carried in order to even get a civilization moving.

Under the pressure of a lack of resources and an urgency to escape, humanity went to war over the necessary materials to build ships for escape. Eldians lose this first war, I guess, given that in the canon universe, the world seems to be split into various ethnostates (if Marley's Eldians were not considered citizens?), so I would assume they go to war this way. They are abandoned on Earth, having been expected to die out, as the rest of humanity escaped on their ships.

But they didn't die out, and they actually survived the treacherous conditions that past humanity had left Earth in, as the instant switch from overpopulation to underpopulation solved some issues regarding exploitation of natural resources. They survived, and far, far into the future, their technology advances, once again, lol, to such a level that they're able to explore the stars again, and they find out the truth about extraterrestrial life; it is just a piece of their own history.

So basically, the word that I am putting as "personal feelings" is 私情 shijyou. And shijyou has two definitions:

[dictionary.goo.ne.jp]

Which is:

But what's that "selfish heart" thing? 私心 shishin? Putting that into the dictionary then we have:

[goo]

(It's kind of like an ouroboros, isn't it? XD)

But that's also how it boils down to the japanese-english dictionary giving us this:

So, all this to say that the word translated as "personal feelings" has two meanings. 1) personal feelings itself and 2) self-interest. And what does self-interest mean?

I think that it is a fair representation of definition 2.

And that's the other point I keep trying to point out: