I love the Twain quote but I’m also a fan of this contemporary parallel observation; the number one thing you learn by studying history is that humans never learn a goddamn thing from history
We truly are nothing but a bunch of barely evolved monkeys. We're even smart enough to know better, but too stupid to do anything about it. "Hey, that's a brick wall dead ahead." Humanity at large: <stomps the gas pedal>
Obviously you've never heard of the Time Cube, invented by the "wisest man on Earth". ("My wisdom so antiquates known knowledge, that a psychiatrist examining my behavior, eccentric by his academic single corner knowledge, knows no course other than to judge me schizophrenic." - Gene Ray).
nobody changed anything, so why should have anything changed?
development does not appear by pure wish or magic, nor by letting time passing by, people have to do it, or it just doesn't get done.