If you watch the court scene at the end they clearly repeat the KGB line that the local operators were primarily to blame for "reckless" decisions. Perhaps you missed this obvious conclusion of the series.
People are free to draw their own conclusions from the movie. The conclusions I drew are:
1. Blame game started right away ("Of course you are responsible. I was not even in the building" Bryukhanov to Dyatlov in the night of the explosion)
2. During the test some actions were taken with a complete disregard towards safety and consequences. Some people would call this reckless.
3. If this accident did not happen at Chernobyl it would have happened somewhere else.