I haven’t formed a complete opinion about Israel’s storming of boats in international waters, politically it doesn’t sound right.
However, upon seeing this footage there is no way that you can claim that the flotilla was acting peacefully. Sure if you are being raided your response would be to fight back, but the savageness of the attack against armed soldiers leaves little wonder in my mind as to why people got killed. You don’t go into a gun fight with knives.
Update: Just released IDF video of the “aid” they were carrying: