Orrrrr it could have more to do with things like how kids like to pretend being animals... ooor a loveable cartoon character... orrrr just enjoying the fantasy aspect in general. :T
You seem to be implying that autistic adults are children or at the very least substantially child-like. The big giveaway here is "kids".
As an autistic adult, I find this troubling, and ask you to reflect on your use of language more.