Believe it or not, lake water quality is a complicated issue. The science is expensive, never complete and as always in our world, there are competing interests.
Plus it's really easy to hate on regulators and regulations that cost money with results that may not be easily quantifiable. There are a lot of people working very hard to protect our SWMO waters.
Water quality protection has been my life's work. Two things worry me the most. Ever increasing population and the inevitable pressures people put on water. And politicians who are more interested in getting elected the next time up than doing the right thing. IMHO, the higher up the ladder you go, the bigger the latter problem becomes.