This thought came to me while I was having dinner.
So my train of thought started with the Armor Stands. They were just supposed to be passive butlers that sorted out valuable materials and put them in chests, right? So how did they panic and end up rebelling?
Well, apart from sparring, they never seemed to do much outside their programming in the short time that they were passive. So I thought that the Block Corruption somehow altered their programming to become hostile!
Problem was, they killed Green of their own will and before they became hostile. So here's what I'm thinking - the Block Corruption has ravaged Minecraft in the past and altered mob programming to become sentient!
I kind of like this theory, but there could still be holes in it.
⬇Throw your hole-punching pins in the replies!⬇