Well, reason in an attenuated sense would be needed to judge the results. This would be instrumental reason, the fitting of means to ends. But this kind of reason is so neutral that it's used even by insane people. An insane person might "reason" that if she presses her doorbell ten times, she'll be able to fly to the moon by flapping her arms. That's goal-oriented reasoning. But her goal wouldn't be based on logic since her worldview is far from logical. There are nonrational inputs to her decisions.

Likewise, although we have to use at least instrumental reason to avoid behaving chaotically, we needn't make reason our sole criterion. Morality, sustainability, usefulness to humanity--these values aren't based on pure logic or science, but on a faith-based feeling of sacredness or of something's ultimate importance.