Sirens in my rearview mirror

I got pulled over by a cop tonight... first time ever. Stated reason: my back light was out (something I was planning to take care of tomorrow). Real reason: I was living a bar at 2 a.m. in Wasilla. Don't worry, I didn't get a DUI, nor a ticket of any kind. Water had been my drink of choice all night long... I was DDing for a friend since it was her birthday. In general, I actually found the whole incident to be a good experience. I got to see first hand the inside of a cop car and partake in the tests I've only heard rumors of, without a single, associated consequence. Here's the question I'm left with though: Is the labrynth of sirens and flashing lights a good thing in that it does catch those driving drunk, or is it overdone, based on an absolute assumption that everyone passing at 2 a.m. on Saturday has most likely had something to drink?