A new flotilla is about to set sail for Gaza from Lebanon. Another one might come soon from Iran. These are terrorist-harboring nations, the very people we Israelis don't want Hamas to be able to be in contact with for fear of arms smuggling. Iranian and Lebanese ships must not be allowed to reach Gaza.
These flotillas are very different from last month's Turkish flotilla. Then, there were hundreds of naive peace activists onboard and a few dozen violent provocation activists. Here, the ships will be manned solely by provocateurs and chances are higher that there will be Hamas-bound weapons as part of the cargo. Had we dealt with the previous flotilla in a smarter way, avoided casualties and an international outcry, the Lebanese and Iranians maybe wouldn't have even thought of sending their own "aid".
Some fear that intercepting enemy ships (and this time, that is exactly what they are) might start a war with Lebanon and Iran. I doubt that will be the case. Neither of them have any interest in a war. That is especially true about Iran, who knows that declaring war on Israel and firing missiles on it would give a green light to Israel, and possibly the United States, to attack Iranian nuclear facilities. After all, if fear of being bombed by Iran is what keeps us from taking action, we'll have no reason not to do it anymore.