Oh, absolutely. It was in the US's best interests to stop an insane Stalin from gaining even MORE land, power, and resources. I'm not saying anything was done for the good of the world, even if the world benefited from the US's actions overall.
The thing is about the Nazis is that they hated Jews and they hated minorities. The Japanese simply felt everyone was inferior and was treated as such. The scariest part of Stalin was that he was so unpredictable and no one really knew what bat-shit crazy idea he'd come up with next. The guy essentially died because he was so paranoid that he killed his own doctors because he feared conspiracy, for crying out loud.
For an example of Stalin's personality, this is one of his more famous quotes:
"The greatest delight is to mark one's enemy, prepare everything, avenge oneself thoroughly, and then go to sleep."
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