It's very simple: Many thousands of years ago, we discovered that if we carried on doing the same things, we wouldn't die, because the things that we've done before by definition didn't kill us, and therefore as long as we carry on doing them, we'll be okay, and it's very sensible not to do anything new, because it might kill you.
Vrlo je jednostavno:  Prije mnogo tisuća godina, otkrili smo da ako nastavimo radeći iste stvari, nećemo poginuti, budući da stvari koje smo radili prije nas po definiciji nisu ubile, i stoga, dokle god ih nastavimo raditi, biti ćemo uredu, i vrlo je razumno ne činiti ništa novo, jer bi nas to moglo ubiti.