I found a great explanation here:
http://sciencequestionswithsurprisinganswers.org/2013/07/30/what-did-schrodingers-cat-experiment-prove/
And I will copy-paste the summary at the end, which might be enough for many people to definitely understand!
"Careful analysis reveals that the Schrodinger Cat "experiment" would play out in the real world as follows: as soon as the radioactive atom interacts with the Geiger counter, it collapses from its non-decayed/decayed state into one definite state. The Geiger counter gets definitely triggered and the Cat gets definitely killed. Or the Geiger counter gets definitely not triggered and the cat is definitely alive. But both don't happen.
In summary, quantum state collapse is not driven just by conscious observers, and "Schrodinger's Cat" was just a teaching tool invented to try to make this fact more obvious by reducing the observer-driven notion to absurdity. Unfortunately, many popular science writers in our day continue to propagate the misconception that a quantum state (and therefore reality itself) is determined by conscious observers. They use this erroneous claim as a springboard into unsubstantial and non-scientific discussions about the nature of reality, consciousness, and even Eastern mysticism. To them, "Schrodinger's Cat" is not an embarrassing indication that their claims are wrong, but proof that the world is as absurd as they claim. Such authors either misunderstand Schrodinger's Cat, or purposely twist it to sell books."
