Bowser & Alcaray
You both brought up pretty much the same fly in the ointment. You're right. Evolution isn't guaranteed to work, and in fact it fails far more often than it succeeds. Every new species is an experiment, including us. If we refuse to grow up and assume our responsibility toward life on Earth, we're doomed, and we might doom all the other life on Earth. It happens--brains make stupid decisions that kill the body.
The jury's still out on us. Stay tuned...
--Robert