Okay, here goes my try...

Back when Misa first saw Asuka's video, she was so excited about it she couldn't help but masturbate while watching it and as what left of Asuka stopped to move Misa had a most powerful orgasm. Then just after the video ended, Misa watched it again and then again, countless times. She was captivated by the sight of a girl condemning herself to a most horrible death for the sake of making the world better while also entertaining the crowd. Being a famous model, she had been dared for Ice Bucket Challenge, but she declined it as boring. It never occured to her to turn it into someting much more gruesome, more entertaining, and thus more contributing to the sosciety. As she rewatched Asuka's unbearable suffering again and again, Misa couldn't help but wish she was the one to come up with such an idea.