From the sounds of it and the comments by others who worked with some of these people, their safety record and concern was questionable.
If your vocation is dealing with firing guns, setting off explosions, working with high speed car or helicopters or whatever, you must follow the laws, guidelines, standards, etc. If that's meetings to review, chain of custody of elements in involved, experience, procedures, etc., then opting to veer from that puts people at risk. A movie set, a construction site, law enforcement -- they all have standards.
The fact that a well known actor pulled the trigger makes it headlines, clearly. The fact that it was a 'simple' as a revolver makes it a lot easier for 'us' to try to judge. Seems like it also makes it easier to prevent injury.