Mouse is a character in the creepypasta called Mouse.avi.
What makes it close to Pure insane?
When the Creepypasta starts, Mouse walks all around the streets without feeling happy, making him insane from the start.
He/She doesn't mind about the creepy piano music playing, making it possible he would creep someone out without feeling remorse.
Mouse didn't mind the static in the background, meaning he might remorselessly crash someone's computer.
It is possible Mouse temporary sabotaged the Creepypasta's electricity video footage so he would scare the viewers.
His/Her insanity is taken more seriously once the video clips play on again.
Mouse didn't feel any shock when the screams were being played.
He/She slowly and insanely smiled while he was walking.
He/She caused several windows to get broken.
Mouse putted the whole town on fire and doesn't feel any remorse for doing it.
When the screams of the video and possibly other characters who were within Mouse's environment were very obvious, Mouse smiled.
He/She committed suicide, showcasing his insanity and making Mouse pass the insane standards
Faux sane qualities
Although Mouse doesn't take any on screen pleasure of sabotaging the Creepypasta's electricity video footage, he/she makes no effort to fix it.
Although he only appeared once in a creepypasta, he still passes the insane standards due to remorselessly putting an entire town on fire and smiling at the sound of other characters screaming.
What prevents it from being Pure insane?
It was never known how many characters were in the environment Mouse was in got injured or burned. This is a minor sane quality due to how obvious the destruction Mouse created was.
Verdict
I am going to say Yes here. Time for you to vote.