Barcelona, Valverde didn't learn from Roma shock last season. Then it happened again vs. Liverpool. Why?

Maybe as a kid you didn't see the point in History class, reading up on all those men (and yeah, they were probably mostly men) of yesteryear, with their outdated ideas and senseless battles won and lost. Maybe you failed to see how events from centuries ago have any relevance to the here and now. And maybe that's why some annoyed teacher or parent quoted the philosopher George Santayana to you: "Those who cannot remember the past are condemned to repeat it." Ernesto Valverde was likely never...