Disappointment

I heard that the definition of insanity is repeating the same tinbg over and over again and expecting a different outcome each time. This should be extended to include people who don't bother to observe the process before them when another engages it.

Lemmings come to mind. Lots of sad silliness.

People need open their eyes and ears, and try and learn from the mistakes of those they have had opportunity to observe not five minutes prior.

It would save a lot of disappointment.