What @daikoyu said.
I don't have Bust the Dust, but I made the mistake of creating a child Sim with the creative trait, and... yeah. To repeat myself from the "autonomy" thread (because it belongs here)...
As I joked to a friend:
Parenting -> Discipline Recent Behavior -> Over It -> Put Up For Adoption
At the same time, I worried that perhaps his relationship with his parents would be damaged because he was SO PERSISTENT in making messes that basically the only times an adult interacted with him it was either "help with homework or school project" or progressively stricter discipline for all those messes. Seriously:
Kid: makes mess
Parent: Parenting -> Discipline recent behavior -> calm -> ask not to make a mess
Kid: immediately makes more mess
Parent: Parenting -> Discipline recent behavior -> firm -> express disappointment for making a mess
Kid: immediately makes more mess
Parent: Parenting -> Discipline recent behavior -> strict -> give time out for making a mess
Kid: goes into timeout with a snit, then immediately makes more mess
Me: You little (#)@*#@&#& WILL YOU STOP!
Parent: Parenting -> Discipline recent behavior -> punish -> ground for making a mess
Kid: little orange tense sliver at the end of a mass of inspired moodlets, so immediately makes more mess
Me: Is there a "put child up for adoption" option on the computer?
Parent: Parenting -> Discipline recent behavior -> punish -> double ground for making a mess
Kid: immediately makes more mess
Me: I will not delete a child. I will not delete a child. I will not delete a child. I will not....
Parent: Parenting -> Discipline recent behavior -> punish -> triple ground for making a mess
Ad nauseum. Eventually I got the bug where all options were "stealthily," like "steathily use toilet, stealthily get leftovers, stealthily do homework, and then stealthily go to bed." LOL, except that he hemorrhaged responsibility, argh!
I've since downloaded Bienchen's mod forbidding autonomous messes.
TL;DR: @daikoyu is absolutely correct that if they're inspired their default idle appears to be make a mess. It's THE WORST and needs to STOP.