A call for further training for police officers to deal with potentially suicidal subjects is not invalid—more training is almost never a bad thing. A variety of studies have concluded that a significant number—10-20%, depending on the study—of police contacts involve persons with some degree of mental illness, or who are at the time of the contact experiencing a significant mental health crisis.
So, more training is good—but training has costs. It takes money and time (which is also money) to give officers CIT and other mental health training, but many (if not all) law enforcement agencies are dealing with at least some manner of budget crisis. Some have been outright defunded, while others are saddled with budget cuts stemming from "reallocation of resources" mandates from elected officials.
Further, it's pretty fair to say that no amount of training could have changed the outcome of the incident in Sergeant Bluff a year ago. It's also pretty fair to say that had the responding officers had more information than just a burglary call, the result may have been different—had they known of the subject's compromised mental state they might have had a different approach.
The shooting death of Michael Meredith is quite clearly a tragedy for everyone involved—the family of the man, the individual himself, and the first responders who were placed in an impossible situation that fateful day. A call for more training in the aftermath of this terrible event is an understandable reaction. The only logical next step, however, is to provide police departments with the resources necessary to fulfill that request.