
Maybe it's his broken mind poping up?
The guy is legit crazy.
Maybe his madness is more prevalent than we think?
He just knee jerks kills people who may be or become a thorn because it's easier to deal with than actually work on making things better. He wants everyone to obey him with no doubts.
It's the opposite of this other series I'm reading. He realizes his madness and quick to kill behavior left him dying a miserable hunted by everyone death.
In his regression, he is still crazy but not quick to kill. He's also funny as he mentally torturing everyone around by saying crazy things. But is noble in his own way.
https://www.mangago.zone/read-manga/the_return_of_the_crazy_demon/

It's brilliant.
Hits everything I love, cultivation, regression/isekai/reincarnation, character growth, crazy humor, frenemies, and a moral code of the lead.
This story...I'm curious as to where it is going and how it will end...but that's it.
The growth I could see of his character in regards to his sister and her fate...has fallen since the school arc.
It's like he is emotionally and morally regressing to his past mad self and his teacher doesn't care.
This latest incident...it just drifts us further away from what he once had when he was around his sister. Without her, he is a near complete psycho.
If we get insight into his action regarding this it would be one thing...but he's killing potential allies and it doesn't make sense.
It feels like he is committing a fatal flaw and outigt becoming a tyrant when he could have an anti-hero.
But why?
A little bit of conversation could have persuaded them.
Was it really necessary? Or was it all a test for Grey because you don't trust him?
It just seems like a waste. They could have been useful.