Just speculation on my part, but I suspect the west's goal isn't to win the war rapidly. Every slow decision exterminates more Russians. Russia's population is going extinct and the population age pyramid of their culture has inverted. Russia would not have been capable of waging war in 5-10 years, just not enough warrior-age men.
So if inside the Pentagon they perceive Russia as a perennial and persistent threat to western interests, slow-playing this war doesn't just end in a final peace, but it ends in the extinction of the Russian threat forever.
If 500,000 breeding-age men die on the Russian side of this conflict, they are an extinct people.
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