The pigs had objectives other than the benefits and the good of the other animals. On the contrary, their objectives were to use, conquer, and capitalize on them. One of the conflicts in Animal Farm is the strong against the weak. The strong are the pigs and the weak are all the other animals. There are two main offenders of the weak: Napoleon and the pigs in general.
Napoleon was a tyrant. It is very likely Napoleon and the other pigs were conspiring to take over Animal Farm so that they could take advantage of the situation of having many animals at their disposal. Although, Napoleon played a very important role in the assault on the weak. Napoleon most likely was the originator of all the decisions that go against the morals of the animal society. He is the one that initiated the violation of established resolutions, and concealed it by altering the resolutions. What satisfied his pleasure is what took precedence over everything-the animals, honesty, commandments, etc. He gave himself the credit for every good thing, without any recognition to the other animals, such as the building of the windmill, and the victory of the Battle of the Windmill. In addition, he is the one that completely transformed the farm into the same or worse way it was in the hands of Man. He made the pigs mimic Man: adopted all its bad habits which were against the animals, with the exception of the pigs. The other pigs were also involved in taking advantage of the weak.
The other aspect that was against the weak is that the pigs in general clearly took advantage of their leadership to exploit the other animals. This could be proven multiple times, starting from nearly the beginning of the story. Even when Snowball, a good guy, was still in the picture, this (exploitation) was happening by the pigs deceiving the other animals to hog all the apple crop. The pigs gave the other animals little food, while they lived a lavish lifestyle. They lied to the animals by telling them lies about their memories, and giving them false information for their own benefits such as, for example, equality in rations would be contrary to the principles of Animalism. They overworked the animals while they did not work laboriously, and used them for money. The farm grew richer without making the animals themselves richer, except for the pigs and their companions, the dogs. They announced themselves more superior than the other animals, and began treating them like slaves. They accepted becoming like human beings, and having the same interests, so that they helped make the farm in the same or worse condition than when it was controlled by Man.
The actions of Napoleon and the pigs in general, therefore, challenged the weaker animals. They used the other animals' trust, and misused their powers to take advantage of their weaknesses.