Tex admitted it was his own fault not the holster or the firearm he was using.
In all cases it comes down to the shooters fault. The question becomes what are all the contributing factors, the ‘chain of events’ leading up to the actual incident. Same thing in aviation accidents or other accident investigations. Many factors from health and state of mind of the individual, to equipment and it’s maintenance, required training obtained or not, trained habits, and often external factors like lighting, weather, exhaustion, distractions. So because a person says “ oh, my bad” doesn’t really explain the cause or exonerate the other factors involved.