Here is my POV to end MNB, instead of pushing aditya and/or madhu from the cliff, samaira should bring them to the point where they accept their crime and she should be recording as a proof. She should bring them to the same court where decision went against her to prove her innocence.
They have accepted a lot of time in front of samaira but no one thought of recording as a proof against them. Pushing them or killing any other way is not right. It will make her a bad character.