I've been playing through the game and had gotten all five main endings, and started with a new save file. I noticed that after the first play through, the Goliath Tank in the Amusement Park wasn't hostile starting with the second play through, even before I got endings C, D & E. Going for ending A, I've noticed the tank wasn't hostile.
My question is, is the tank initially hostile, or did I just blindly attack it because another machine said it was dangerous beyond where he was? I think it may have been hostile initially, but because the game does save data outside of the save files which seem to affect it even if you were to remove all the save files, I'm no longer certain.