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?