Cassie

Well, sometimes we project our own emotions on a favorite character. What if Michael did the same thing? He had a nightmare childhood (I suppose) and a terrible father, his sister does not share his views. 

Therefore the lines "Foxy was involved in a failed take-apart, put-back-together attraction" - about Michael’s life. And "Freddy, Bonny and Chica" is Mike, Vanessa and Abby. They were also touched by madness, but they could go on living a normal life……..unlike Foxy, who "was never quite the same again".

I don’t think Michael’s going to say that something was wrong with his father (that’s why he so blindly follows the instructions, trying to get his father’s work done). So he says this when they find the broken animatronic: "Kids can be so heartless”. BUT his father literally created the Foxy model as it is represented in the pizzeria. His father is to blame as the creator, not the children who have torn animatronic apart.

(I guess Michael was a strange kid in school. For example, Abby was not afraid to let go of animatronics and make friends with the class. What if Michael is the same Abby, but without friends and among animatronics? So it’s important for him to finish his monologue with the phrase "Kids can be so heartless”?)