As I've understood, the hurricanes that form every year are actually part of a process of advecting heat energy from the surface tropical regions to the higher altitudes and higher latitudes. I remember seeing a ocean temperature analysis just before and after Hurricane Rita traveled across the Gulf of Mexico, and the drop in ocean temperature was quite noticeable. Similar drops, to a lesser degree, can be observed with all tropical storms.
This process is really important to keeping temperatures around the planet more balanced that they would be otherwise. It also keeps the temperature of tropical oceans somewhat in check, so they don't spawn even more energetic cyclones later on. If we start trying to control this, there is the risk that we will screw ourselves by making tropical storms less frequent but much more severe.