This would very quickly be spun to make the flotilla look violent, and would be used as justification for sinking the entire thing. Israel tolerates (if that’s even the right word for it…) the flotilla so far, because outright sinking them would be too blatant. But if the flotilla starts shooting, Israel (and their absolutely massive propaganda network) will inevitably spin it to make it look like Israel has no choice but to sink the ships and kill everyone on board.