Not a good comparison. A better one would be writing a seatbelt ticket instead of a moving violation.
The problem comes in when the driver decides he's gonna fight the ticket.
I used to do it once in a while, when circumstances dictated the driver should get a break. Sometimes I'd knock a few MPH off an excessive speeder. I don't do it anymore. I've had it come back to bite me a few too many times.
I was admonished by a Judge once. I stopped a speeder for 25+ over the limit, took pity on her pleading, and wrote the ticket for 15 over. You guessed it, the driver decided to go to trial. I had to testify that I saw her going 25+ over, but wrote 15. The Judge dismissed it, based on 'defective citation'. He told me I didn't have the authority to reduce citations. He did, and who was I to usurp his authority?
I stopped a driver for doing a U turn on a freeway off ramp.
The driver was a nice old guy, so I wrote him a $10 seatbelt ticket instead of a $250+ Wrong Way citation. The driver filed a service complaint on me, saying that he religiously wore his belt, and if he had done a U turn as I claimed, why didn't I cite him for
that instead? Got a verbal reprimand for that one.
Never again. If I write it, I write what I see. No exceptions.
If there is one absolute truism I've learned as a cop, it's that the driver you give a break to, is the one that will complain the loudest.... or the civilian version, "No Good Deed Goes Unpunished".