As a radical, Orwell didn't expect to keep his hands clean either. He supported the war against Hitler as he had fought for the Spanish Republican government against Franco. We have become too civilised to grasp the obvious. For the truth is very simple. To survive you often have to fight, and to fight you have to dirty yourself.
War is evil, and it is often the lesser evil.
Those who take the sword perish by the sword, and those who don't take the sword perish by smelly diseases. Orwell expected England to decline after the war. His pessimism is, then, fed from at least two directions - entrenched conservatism and compromised radicalism. After the war you will encounter a sturdy defence of the English culinary tradition, as he looks forward to the resumption of tourism. His greatest strength rests in his truthfulness to things as he saw them, his artistic integrity, and his conscience.