The Israeli soldiers actually boarded one of the ships, the passengers and crew tried to wrestle their weapons away from them and they were shot. Israel acted properly and they were provoked. The organizers of the flotilla knew the rules. They knew Israel would board for inspection and they knew the consequences if they provoked Israel.
Yemen's Houthi rebels commit to peace plan in letter to UN chief, BBC reports (Haaretz)
from the article: Israel Navy commandos: Gaza flotilla activists tried to lynch us