And that made the other to come to a happy peace for her sake.

Good. She would be sad if she found out how they weren't getting along.

And that would make them angry with each other and start killing each other,hence forth killing themselves.

And if they died she would most likely fall into a lifelong depression.

And then Clarity would probably cry herself away for losing her brother,Akira to depression,and yes probably she'd cry for Shade as well.

And everything would just be immensely sad.

Yep. And that's why the two where at a happy peace for the sake of Akira.

She liked them being happy. She heavily preferred it.

Clarity preferred it as well,so that her brother and former brother didn't die by fighting one another.

Yes. because in that case it would be a lose lose.