> off we go onto make the same mistakes
Lessons are never learnt, if humans were able to learn from their errors we would be really superior beings by now, wouldn't we...
Errors are mostly created by peoples' ways of thinking and acting, and thus will be readily repeated after a short cooling-off period allowing them to forget that their obvious genius might not be that infallible after all. You forget those things very fast, it takes mere days before any self-doubt is thoroughly erased and failure is put down to bad luck or somebody else's fault.
So yes, same people make same mistakes. Nothing surprising there. Only (some) young and still inexperienced persons are still willing to challenge their preconceptions, and that ends rather quickly when they start realizing their "teachers" don't know that much either.