I have a theory...

I have a theory on how CatNap became the "villain" and how the Hour of Joy occurred

I may be wrong since I get info from the game and I haven't read the book

But I have some thoughts...

What if CatNap thinks this is all just a game?

After the Smiling Critter franchise fell apart, the Smiling Critters stopped being friends with CatNap because of everything happening. CatNap gets really upset about this since it was never his fault. Since he views the Prototype as a hero, he goes to the Prototype to vent about everything. The Prototype asks CatNap if he wants to stop this once and for all. CatNap says yes. The Prototype says that he's gonna play a "game" where you try and get as many of the employees as possible (this game being the Hour of Joy). He tells CatNap to tell the other toys about this game. The other toys agree, even some of the Smiling Critters, since they're tired of getting tormented and experimented on. They're TIRED of Playtime Co.'s actions. On the Hour of Joy, the toys start killing everyone. Since some of the Critters didn't want to participate, DogDay especially, CatNap kills them and leaves DogDay to suffer.

I have a theory that CatNap thinks that everything he's doing is a part of a game. Especially since he was 8 years old at the time, he most likely believed everything the Prototype said and got manipulated by him. I think he does know he's killing. But, he acts like it's all a game to drown out the reality of what he's doing.

Again, I could be wrong, but I just wanted to share my thoughts.

What do you think?