Why do the characters in five nights at freddy's act the way they do? Example:Why Foxy jumps at you.

My friend said"The employees of Freddy's would dress into the animal costumes(what the characters wear) and play the roles of the robots. One day however, the employees were murdered in certain ways that are similar to how the characters attack. So, this is how they were murdered.

Fredy:NA
Ducky:murdered while screaming
Bunny:tried to fight back
Foxy:tried to run away

I don't know if I'm on to something but, I'm thinking that Freddy is corrupted with a virus or his maker(I call him the maker)was paid to make his like this or he wants vengeance of did it for money. I think this so you can believe me or not. I say that this is the dirty truth.