to Lay on the horn and then politely (sometimes) tell people through the window:

"Do you love your child?

Why are you risking their life then?

PUT THEM IN A CAR SEAT OR SEAT BELT!!!!?"

So far everyone time I have done this, they look at me as if I am crazy, or pretend (I think) that they don't speak English.

 I give up.   I really do think that the deaths will have to add up before anyone does anything.  Very sad.