If security forces are going to perform more functions, which they should...they need additional training. More training for your security teams is an expensive proposition, but an all-important one. 

Mass violence, primarily shootings, is growing and can only continue to do so, and we have a professional obligation to analyze where the failures are and to take corrective action. 

Once upon a time security contracts were entered into for cost containment. That was the driving force behind them.