Your problems with manatees and manatee lovers is not "general disdain"
for boats or boaters. We have lots of active boaters up here, and I've
not seen much aimed at curtailing the activities of those who behave
responsibly on the water.
Who gets to decide whats responsible activity on the water? Someone who
loves powerboats, someone who loves sailboats, or the guy who has a home
on the water and only wants kayaks out there?
To a degree, all the stakeholders should have some say. As an example,
if you live on a moderately sized lake and suddenly there is an
infestation of unmuffled "penis" boats zooming close by your house every
Sunday morning at 8 am, you should have input into whether that sort of
behavior is "responsible." When we lived in the St. Augustine area near
the ICW, I was part of an effort to "ban" airboats from the shallow
estuaries and marshlands in the immediate area because of their noise
and the physical damage they were doing. The owners of these boats were
not acting responsibly. Note I didn't say banned from the waterways.