(1) The protagonist's explanation of decisively cutting his feelings:

The protagonist is an extreme ordinary person, so he will suffer many times because of his "emotion" and arrogance, and directly regard it as a weakness of himself and humanity.

And in "The Three-Body Problem", only those who are indifferent or temporarily let go of their feelings can open up a future for mankind.

Therefore, the protagonist directly thinks that "feelings" are not suitable for the cold universe.

(The protagonist is a fanatical admirer of Vader, who was almost emotionless and "human" during his "real man" period.) ）

And the protagonist is alone, so he hasn't experienced too many positive emotions and bonds, so he doesn't know that these things will become his own strength.

And the protagonist doesn't think that he will have any more intimate people, or think that "intimate people" will be his weakness.

After that, the protagonist already has the idea that "everything can be sacrificed for the continuation of civilization" - and his own emotions are naturally in this "everything".

Therefore, when he finds that feelings are obstacles, the protagonist does not say a word and does something to his own feelings that are in the way.

(2) Follow-up development issues:

Although the protagonist has sealed his feelings, as the listener said, the "sprout of feelings" is immortal.

Later, the protagonist's feelings will sprout again by chance.

Maybe it's to save a child, or it's because of a care - just like the warm sheep sheep saves the mechanical sheep, the little monster wakes up the big monster, and the gray wolf is laughed at in the Year of the Rabbit movie.

At that time, the protagonist's "emotional sprout" will develop, and he will have a fierce struggle with the "ideological steel seal" planted by himself.

At that time, the protagonist's mind will also become extremely chaotic during that time - just like Hines did.

Similarly, the protagonist grows rapidly due to violent emotional fluctuations.

If in the end, the protagonist's "emotional sprout" loses to the "Thought Seal", then the protagonist will be completely blackened, and then become the most indifferent and powerful "meta-hunter" in the "known universe".

If the protagonist's "emotional sprout" wins, then the protagonist will once again have his own emotions, and the protagonist will have the possibility of turning white......

Of course, it's only possible, after all, a lot of the time, emotions are the key to utter madness.

If the protagonist who has regained his "emotion" is hit hard, then the protagonist who grows up rapidly is amazing.