I guess you can spend your time complaining and second-guessing the actions of the Jamaican Government all the while your own country is doing little or nothing to stem the curve.
The Jamaican Government isn't trying to ruin your vacation, they are trying not to let your vacation ruin their lives.
It all comes down to timing. If you can't wait to take your vacation, you have to deal with the consequences of the current world situation regarding this virus. There is no guarantee that November, December and on will be any better but I think you can be sure that the Jamaican Government is going to do whatever is necessary to make it safe to vacation on their soil.
The Jamaican Government is facing a growing tide of tourism where any one or more people may be the "Typhoid Mary" that causes a rampant wave of infection to spread island-wide. Everyone always wants to think they can do a better job until they are put in charge and find out how nearly impossible it is to do it better.
JMO