Right, all those white-ex-plantation-owners-mansion-living-elite risking their lives in the ocean to flee the country... Or asking for political asylum in every opportunity such as during Olympic Games...
If the United States had a wet foot/dry foot policy with the rest of Central America, it would be absolutely flooded with asylum seekers. It's already flooded with illegal aliens risking their lives, paying coyotes to smuggle them across the Mexican border - imagine what would happen if they were automatically legalized.