Orwell's purpose for making readers sympathize with all the animals except the pigs is to make us understand the cruelty of the Soviet regime and its leaders in Russia. The animals represent the Russian people while the pigs represent the authoritarians who exploited them.
In "Animal Farm," the animals function as an allegory to criticize the Soviet regime in Russia. The pigs are supposed to represent the Soviet leaders who, pretending to care about all, actually exploited others and committed crimes to remain in power.
The animals represent the Russian people, who were subjected to awful conditions of life and word, being exploited by the leaders who were supposed to help them.
That is why Orwell makes us sympathize with all the animals except for the pigs. He wants us to empathize with the people's pain and criticize the leaders' cruelty.
Learn more about the pigs in "Animal Farm" here:
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