I think that dispite the fact the toons are adults, they are made to learn lessons, so they have an almost childish side to them the can never fully understand a lesson or heavy topics
It keeps them in a more episodic tv show
So they could learn the same lesson again and again but it'll never fully register or manifest in their mind
Being left alone, they are left to handle emotions they have no idea what to do with
They weren't built to understand what's wrong with them, they can't register what is going on in their minds
That's what handlers were for, to help them, or at least to distract them from their issues
But without them their unresolved and unchecked issues build up until they become twisted
I headcannon this as well lol.
I also imagine they have a somewhat childish nature that allows them to better interact with the kids. They can freely play childish games like tag, hide and seek, etc. without feeling "Awkward" about it like most adults would.

















