Suppose its cheaper to buy oil from Muslim countries, but the option is spending a more money on domestic solutions that use less oil, but cost more.
Is there any condition that your "sound economic practice" could support this?
sound economics is a bit more thoughtful than just "what's cheapeast today." Perhaps that's how you'd make decisions if it were your responsibility, and that's why you think everyone else would do so, too.
mercifully, there are checks and balance on folly.