Well, Naofumi (Shield Hero) can be justified from some side, after all, the first thing they do to him in another world is betray him. Problems with trust, psychological dependence on control. I think in Fujino's game, if Kirito finds out about Asuna's betrayal, it will affect the rest of his life. I have no doubt that he will look at all his future companions through the prism of Asuna's betrayal. That is, he will never trust them completely. He won't even trust Suguha completely.
As for Kirito, I think it's worth making allowances for
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and
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(Sorry I couldn't hold on.)
When the series first started, Kirito seemed like a fresh and cool hero, especially considering that there weren't many really interesting isekai back then. Now, mostly, people look at Kirito through over 9,000 of the same isekai (there are even some where MC are just copies of Kirito)
Yuuta Suo - Hyakuren no Haou to Seiyaku no Valkyria
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Sato Pendragon - Death March kara Hajimaru Isekai Kyousoukyok
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And there are many more examples. So, I'm afraid the whole point is that people don't perceive Kirito the way they did then. Kirito was then a 15-year-old boy who was on the verge of death and did everything he could, experiencing the deaths of others that remained on his shoulders. He helped people as much as he could, and it was no surprise that the girls saw him as a savior and a tough guy. And now they see him as just another isekai hero with a harem, of which there are hundreds. And many people mistake his detachment and problem in communicating with people for arrogance. In fact, only Asuna was able to pull him out of the shell he was surrounding himself with.(If you count it, the guild "
Moonlight Black Cats" that died in full force, but, in fact, it only got worse.) A ruthless time.