There is no such thing as "AUTO-PILOT" switch in climbing. Everything must be manually check and recheck by pilot and co-pilot before takeoff
Instead of passing judgment, how about offering your own stories. There is no climber alive that hasn't done something stupid (except maybe Jay).
Here's two that come to mind:
1) First time in Red Rocks, first route. My partner had been there before so gave me the first lead. We were in Black Velvet Canyon and the higher profile climbs were occupied, so we decided on Sour Mash. In all my excitement, I tied in chalked up and headed up on lead.......without the rack. I didn't notice until reaching for the first piece. I down climbed back to the base, grabbed the rack, and headed back up, a little red-faced. The climbing was pretty easy to start so I wasn't in any danger, just a little embarrassed.
2) Rappelling off a route. I "ALWAYS" attach my rappel device and THEN attach my backup. For some reason, one time, I put my backup on first. I guess in my mind I was all set to go, since I had just put my backup on. It was hot, I was tired, I wasn't thinking. I went to lean back on it when Tiff stopped me.
NO ONE is above mistakes. You can say "It won't happen to me" until you're blue in the face, but guess what....being human is well, part of being a human.