The issue with ARAC is that while you're unlikely to get robbed or killed by someone in their ARAC outfit - those that are off duty or who only bought the license for the spawn location - they still get the alerts.
So when I see an ARAC alert about the fact that @TI Ben has broken down in the middle of nowhere I might fancy going on the rob and paying him a visit because he's a bit of a cunt.
What I'd like to know is whether it's considered metagaming for using the information in this way when you're off duty or whether it could fall within an RP scenario where the ARAC guy is a corrupt bastard while off duty and is just trying to make a bit more cash.