I like the way you think.
Some after the fact reporting (by CNN even) makes me even more convinced they need to be sunk since it appears they are doing their best to subvert and sabotage Isreal.
Not sure how to do links:
http://www.cnn.com/2010/WORLD/meast/06/02/gaza.raid.activists/index.html?hpt=T2
Intersting snippets:
"the Israeli government is offering to receive the ship's cargo, as it has offered other vessels, if it docks at [Israel's] Ashdod port. The Israeli government will unload the cargo, screen it, and deliver it to Gaza."
An attempt by Israel to deliver the goods from the flotilla that was stopped Monday was rejected, the Israel Defense Forces said Wednesday.
Palestinian sources confirmed that trucks that arrived from Israel at the Rafah terminal at the Israel-Gaza border were barred from delivering the aid.
There is a lot more in the article, but from my read - looks like someone trying to make a point more than trying to be good samaritans.
Since that is the case - sink 'em and leave no evidence...