Big difference is that Cuba doesn't try to terrorize the Florida Keys like Gaza does to surrounding towns. They're able to use scrap to send rockets into Sderot and Ashqelon, what more could they do with heavier materials. They need to stop the violence before things get better for them. Also, if there are such food shortages, why do their markets have produce?
Israeli forces demolish illegal houses, power infrastructure in Palestinian village Aqaba (Haaretz)
from the article: U.S. congressman: U.S. should break Israel`s blockade of Gaza