| Phosphates -- a component found in many dish and laundry detergents -- are one of the biggest pollutants of our nation's waterways. Phosphates cause "massive algal blooms in waterways."
Algal blooms look like this and this and this and have adverse effects on marine wildlife, not to mention human health. Oh, and to help understand the financial and taxpayer costs of phosphate pollution, here's a 13-page bibliography on the "economics of harmful algal blooms."
So, you know, a ban would help preserve marine habitat, protect human health, and reduce the economic, medical, and taxpayer costs associated with harmful algal blooms.
But...but...phosphates make my dishes sparkly! And, you know, that's totally worth "beat(ing my) local legislator to a bloody pulp" over! That's right, folks. Clean your guns, because it's revolution time!