I think the shemaghs vs black will be ok. If needed we can give the cops white armbands. The majority of people will be on the robbers' team anyways.
I can however see where you're coming from Brendon. I've personally spent more time with police and private security contractors, who often wear solid colors. However you do have a good point since the last 5 years has seen a drastic increase in camouflage clothing use by both federal and local law enforcement agencies. A lot of things have been changing in the world the last few years. Not long ago the most common issued camo pattern was US woodland style uniforms; now it is woodland digital variants.
Ultimatly, it comes down to the fact that the majority of airsofters wear camouflage. In this scenario, we're needing the majority of shooters on the terrorist team. Thus, the team colors.