A Category 4 hurricane is nothing to trifle with. I'm not sure that even this guy could make any headway against 140 mph winds. I know I'd be getting blown, not merely backwards, but clean off the island! Even if I could make any forward progress, flying debris would present a constant (and potentially deadly) hazard.
Not to mention the flooding!
I don't mean to make light of the situation. I sure hope the people living on Haiti, etc. have a means of getting to shelter.
It always makes me feel rather guilty to be glad that a hurricane is going somewhere else. Of course anyone living in hurricane-prone areas wants those storms to keep away, but that only means somebody else will get hit. Kind of a NIMBY thing...