why do the police speed?

Not really a perk, but when you are running calls back to back you want to get there and get the heck out. No one needs more drama. Everyone complains that the police take to long to respond as if they are waiting around the corner when called. In truth, if someone gets their cell phone stolen during a robbery; one does not want to wish to risk their life by speeding to the scene in hopes to find the phone full of memorable photos and contacts. Take the report and move on.
I think we're talking about non-call situations here.. when the lights are flashing it's a given that the officer is in a hurry and therefor speeding.. what I am referring to (and I believe others are too) is prevalence of fast moving police cars that are not en route to a call - - they're not hammering down the street so to speak, but they ARE speeding - - be sure, you and I would get pulled over for it- period.