How about this take:
The people being beaten were shooting (and killing) other humans with guns.
An unnamed Israeli commando, who purportedly led the raid on the Mavi Marmara, today told Israeli news website Ynet News that he shot at a protester who approached him with a knife. "I was in front of a number of people with knives and clubs," he said. "I cocked my weapon when I saw that one was coming towards me with a knife drawn and I fired once. Then another 20 people came at me from all directions and threw me down to the deck below."
Gaza flotilla activists were shot in head at close range
Are you serious? A soldier is confronted by someone approaching him with a knife. He gets shot at. There's a problem here?