I just asked my daughter why it's important to clean up her toys. She said it's a good thing to do. I asked her why it's a good thing to do. She said it's a good idea to clean up before nap time so that there isn't stuff all over the floor for people to trip on and get owies.
Okay cool, imo the desire to avoid hurting her feet is a good justification. What does she say if you ask her, “Are there good reasons for not cleaning up the toys?”