This line of thinking ignores the principle of indirectness (or obliquity), which shows that in a complex interactive environment, a direct focus on a single goal can elicit reactions which tend to prevent the achievement of that goal.

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While the separation of duties principle applies here, you may be thinking that there would be other principles that can apply as well.

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"Our voters stopped thinking of us as the party of principle because we lost our commitment to, and confidence in, our core principles, " he said.

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