Why is it important to reduce boat and jet ski speeds in sensitive shorelines?

The waves reach the shoreline ,catch the soil material,(sand .Black dirt) and take it out to sea,ocean, This is called Erosion. This is why the communities with beaches are always hauling sand to their beaches for the tourists to roll in.. New Jersey Hauls in many tons of sand and packs it tight. The sea comes rolling and takes it out again. I fished in Florida with professional fisher men and they were very particular about the waves they created. Those which smoked put the filters from their cigarette's in their pockets. Threw it in the Garbage on land,. Tourist's like clean white beach sand. Next time you go to Florida see How many cigarettes filter you see on the beaches. Then look where you live. I live on the shores of Lake Michigan. It is terrible the Garbage I see.I AM SURE THIS IS THE RIGHT ANSWER