Haha, I was right. You're mad. Big mad. Well, I'm mad too. From your sniveling backtracking to your refusal to question your own motives or thoughts, it's obvious you're defending and sympathizing with a baby murderer because her existence challenges your worldview and beliefs. You're immature, ignorant, arrogant, and bigoted. You are manipulative, and you are cruel.

Being sadistic, entititled, or thinking you are above everyone else can all be the result of someone’s mental illness.

But they're not, and you don't have the authority to assert they are. Those are the qualities of an evil person or just an asshole. You are a perfect example of this.

While the transition is gradual, we normally understand a physical and psychological alteration as an “illness” when it causes the affected person pain / discomfort / limitation or when it makes living in current society close to impossible.

but additional possibilities don’t rule out mental illness as an option.

Repeat after me, dipshit: You do not have the authority or the qualifications to label other people mentally ill.

You do not have the evidence, training or education required to label her mentally ill. You've never even spoken to her or met her. You do not know jack shit about her mindset. So you're not going to label her mentally ill.

You're not going to claim she's mentally ill.

You're not even going to imply she's mentally ill.

You're not going to do anything but shut your mouth and learn to stop being an ableist prick.

Understand?

I do not believe in good and evil, not a religious person.

Good and evil aren't religious labels, they're moral ones. Atheists believe good and evil exist because they're labels we apply to behavior that recognize the agency and responsibility other people have for their actions, and those labels acknowledge the obvious fact they need to be held accountable and punished for them.

I also didn’t meant to give the option to change to the murderer,

Yes you did, stop lying.