The added piece here is that as you expand the powers of private security forces, you expand the potential for the abuse of power. So the concern about the potential lack of regulation of this industry is a concern that is present to a greater degree with the amendments being proposed than it is with the existing legislation. But that's not to say there aren't also concerns about the current level of regulation of private security.
On March 1st, 2012. See this statement in context.