Wrong Height

We went to San Francisco yesterday for a change of atmosphere and a long walk along the piers. We finally let Jordan out of the stroller to play for a few minutes before heading to our next destination. He was playing on the pier (the one with the fence all around so small children can't fall into the water) and calling to the "duckies" (seagulls), when he ran over to the bench we were sitting on and shoved something in his mouth. A lovely cigarette butt from the 2 1/2 foot tall disgusting public ash tray. Why do they make public ash trays the wrong height?