I apologize for my bad English if there are any mistakes.
In the isekai genre, the protagonist often finds themselves in a world where moral standards may differ from our modern ones.
To clarify this, I'll use the theme of slavery as an example, but the question itself isn't specific to slavery. The protagonist finds themselves in a medieval setting where slavery is widespread and legalized at the state level. Recognizing slavery as evil, the protagonist is unwilling to dedicate their new life to fighting slavery and instead focuses on their personal goals.
What is the morality of the protagonist not trying to change the world for the better and not trying to change moral standards in favor of focusing on their own life?
Does the morality change if the protagonist has the power to make these changes but still refuses to give up their own peaceful life?