A weapons safety course doesn't mean anything when it comes to criminal liability on a movie set. All that does is absolve the studio if stupid shit happens because an actor did stupid shit. It was not an actor that did stupid shit here, it was the armorer.
The armorer that Baldwin hired and continued to employ long after she was shown to be ill suited for the job, which made him and the company civilly liable.
Baldwin and the production company already came to a civil settlement with the deceased's family.