Even when you have conquered him, do not adopt hisvices. No animal must ever live in a house, or sleep in a bed, or wearclothes, or drink alcohol, or smoke tobacco, or touch money, or engagein trade. All the habits of Man are evil. And, above all, no animal mustever tyrannise over his own kind. Weak or strong, clever or simple, weare all brothers. No animal must ever kill any other animal. All animalsare equal
Orwell refers to the nature of mankind as malicious, however the reminder of Old Major implies that animals CAN adapt human vices--as exploitation and deceit is unlimited to anyone.
Rhetorical queestions are utilized to acknowledge exploitation as their own fault if they do not do something about it. Simplifies complex argument.