After you brush aside the rheroric about how dangerous it is to speed, a favorite excuse for cops to use to discourage speeding is "that it makes little difference in terms of time", which is a counter argument to people that claim to save time by speeding.
Just do the math.
As an example, it is approximately 240 miles between my house and Las Vegas. Except for the 10 miles or so going over the Cajon Pass, the drive is entirely level and relatively straight driving across the desert.
If I drive 80 an average of 80 MPH, it will take me about 3 hours to get there. If I drive at only 60 mph, then that time gets upped to 4 hours.
I have saved an hour by going 20 MPH faster. Even if I burn up more gas by doing that, I spend 10 minutes at the gas station, which still gives me about a 50 milute advantage over a 240 mile drive. Those times would compound the further the distance travelled.
So, when simple mathematics can blow that argument right out of the water, why do cops still insist on using it?
Wouldn't the Highway Patrol, State Trooper and Constable officers garner a lot more respect if they actually came out and said that they were "meter maids with a gun"?
No disrespect meant to cops, but any one whose primary beat is an Interstate Highway, or major throughway, that's about all they are really going to be. After all, I don't imagine that Interstate 215 gets a lot of bank robberies, burglaries, or shoplifters. Sure, they may get the occasional high speed chase, but what else is there to do besides write citations and take accident reports-something that Community Service Officers do in many, if not most jurisdictions?