The IDF could have used water cannons or tear gas or any other standard crowd control method. Instead they used live ammo. Why? The obvious answer is that now many civilians will think twice before joining a Gaza aid convoy, knowing they may pay for it with their lives. One can say that deterrence has been achieved, a goal always high on the IDF's list of priorities.
Trump: Middle East would be more stable if Saddam, Gaddafi still in power (Reuters)
from the article: Israel Navy reserves officers: Allow external Gaza flotilla probe