There is no punishment, it is prevention of 1.5 million murderers to commit murder one by one.They all support the Hamas charter that calls them to kill Jews. all flotilla participants have joined the Islamic Jihad, that aims to destroy the world starting with Israel. and so the Jihad is a failure.
Yemen's Houthi rebels commit to peace plan in letter to UN chief, BBC reports (Haaretz)
from the article: Gaza flotilla activists determined to sail on despite obstacles