anyone ever think it's because schools and hospitals are some of the largest structures in gaza? qassam rockets aren't huge but they're too big to just store them in some hovel somewhere.
and besides, any of hamas rockets that can be stored inside a building like that aren't really a threat to begin with. the qassam brigades are 95% psychological. hamas doesn't even use the rockets that are actually effective because they're too afraid of losing the hardware.