If you are swimming in the water, be careful and responsible, if you are driving a boat do the same, if you are riding a jet ski be careful and responsible...etc, etc...
We vacation on a lake in Michigan every summer where jet skis are all over the place, and there are people riding them who don't know what they are doing and are inexperienced. We were towing our daughter and her friend on a tube from our boat and someone on a jet ski didn't see the line and almost nailed us on the boat. We can't stand that inexperienced and foolish people are on them (not everyone, mind you), It just causes us to be more careful and keep a close eye out for them. They aren't going to go away people, just be more careful and aware of your surroundings. The thing that bothers me about them in Negril is when they aren't watching in front of them because the driver is trying to solicit business from the beach.