(Uh oh)
“Here we go,
(Is that what you said?)
And now he’s going round like “off with their head!”
(No!)
Yeah, I’m pretty sure he means it,
(Seems it)
What was I meant to do?
(What were they meant to do?)
Like what was I meant to do?
(What were they meant to do?)
No, but what was I meant to do?
Sorry, not sorry ‘bout what I said,
I’m just tryna’ have some fun!
Don’t worry, don’t worry, don’t lose your head,
I didn’t mean to hurt anyone!
L-O-L! say “oh well!” or go to hell,
(Just go to hell!)
Sorry, not sorry ‘bout what I said,
(Sorry, not sorry ‘bout what they said)
Sorry, not sorry ‘bout what I said!
Don’t lose your head,”
https://www.youtube.com/watch?v=kAthQG1aKho

And here comes the disruption dismemberment

A Kitty, hi Kitty, I know you killed a man, with a bat! in the back of the head~
They're about to be executed and they don't care really, they gave up after Kiyotaka died, and if given the chance they take a bat to Byakuya's head, they don't actually get a chance in canon and that's why they don't do it, but if they do get a chance they give themselves up immediately when accused, a blunt "yeah, it was me, he deserved it" they aren't even accused really, just asked a question, and it's just "oh, it was me, I did it"
They want to die at this point, they want to lose, and they figure they may as well get rid of someone they think is bad and then go down with that so everyone else gets to survive but they get take out someone they hate to "help" everyone else, and they get to die, they get to go be with Kiyotaka again
They don't feel bad at all, they don't care anymore, just kill them Monokuma, please, they want out

"Don't Lose Your Head"-Six: The Musical
Kitty-Me