The previous post was right. The other animals' placed complete trust in Napoleon and the pigs. I actually place a great deal of blame on Benjamin's shoulders. As a cynic and one who withdraws from the political activism of the farm, Benjamin is actually moved to action when Boxer dies. Yet, he does little with this after Boxer's death. I think that Benjamin "went wrong" with his lack of follow through in understanding the reality that Napoleon was perpetrating upon the animals of the farm. The fact that Benjamin has intelligence in his ability to read and understands the nature of the political reality surrounding all the animals makes his withdrawal and lack of leadership even more endangering to the other animals. At the very least, they might be able to claim some defense of ignorance. I am not sure Benjamin can claim this, indicating to me a very "wrong" direction being taken, proving that cyncism does not benefit anyone and actually empowers the aggressors. This is a lesson that has been proven time and time again in the modern setting, and one that can be fully understood through Orwell's work.
In Animal Farm, the other animals went wrong by placing blind trust and faith in the pigs and not questioning any of the decisions that were being made. Some of the animals have doubts about the decisions that the pigs make; however, they do little to suggest change. For example, Clover does not agree with some of the pigs' decisions, particularly one of the changes in the amendments. When she challenges the change, Squealer gives her an inaccurate explanation as to why the change was made. Clover accepts this explanation without considering that Squealer is using his charisma to influence her. If she and others stood up for their society and challenged the decisions of the pigs, they may have been able to prevent the downfal of their society.