An Acknowledgment

Is it so hard for the police men, firefighters, or paramedics to smile or nod?  Today we were sitting at two lights one with a police man and another with a fire truck and ambulance.  Zeke had his window down and was frantically waving hello to them and no one, not a single person waved or even acknowledged the fact that an admiring child was waving.  I wanted to honk my horn and yell at them!  Now I can understand if they were busy... but we were sitting at a stop light!  I had to tell Zeke that maybe they were too busy to wave.  Inside me I was crushed for Zeke!  I think it should be a requirement for them to all have to take a class on "Proper Child Acknowledgment".