I think you've misunderstood what they do. Rather than re-enacting events that happened they are used to help security personnel, the emergency services and other parties to better train and visualise their response methods.

"[i]Does it make anyone else feel that you're being funneled news in a direction that isn't done in an objective manner?[/i]" Media reports aren't objective? Well I never. In other news, the Pope is Catholic and bears continue to defacate in woodland.