“This is a good opportunity. Rishia, I can’t put up with you anymore. Frankly, you are weak.” (Itsuki)
So he’s finally become like this.
In order to make sure his situation doesn’t worsen, he has decided to say the truth.
And because he sensed he was getting cornered, he decided to make Rishia out to be the bad guy.
Where is your justice now? What self-righteousness, what hypocrisy.
Even the Swindler and the Slave dealer are better that this.
At least they understand that they are at fault.
They are much better than a kid who acts on a whim and then labels his actions as justice.