Discouraging and Puzzling

I was home for a sick day today and noticed outside my bedroom window, there was a guy in a mini van fondling some prostitute.
I called the police, and was very upset/angry at the whole scene, being home with the toddler and all.
The police were very understanding of my emotion, as I continued to describe the scene and give the license plate number.
They said they would be on their way to deal with it.

During this time, Chinese Grandmas were strolling by and moms with kids as well.

The policewoman calls me back and says, "That plate you gave us doesn't match up". I said "Pardon?, I can still see them having sex in front of my house". She was decidedly disinterested in the events now and didn't hesitate to reveal her, "sorry, whatever" tone. It was discouraging.

Finally I noticed the van was gone, leaving only a splotch of splooooge which the Crows immediately seized upon.