"At the beginning we people were like the animals"...

Fantastic deduction, have you (the narrator -> "dieZuversicht") been there and witnessed it (= true science)... How do you know how all this started? Maybe there never was a beginning in nature ("...like the animals..."), maybe we were created and immediately started a small civilisation.

Nobody knows how it all started... NODOBY! Not your religious guru, not Richard Dawkins etc.