Iran really, really shouldn't have offered to help with the flotillas. You aren't going to help. At all. In fact, by merely making the offer, you are providing the blockade's apologists with more ammo than they could have possibly dreamed of.
Then again, considering Iran, maybe that was the entire idea. Their regime isn't exactly popular right now, so picking a fight with the Israelis may be the entire point. Sure, it won't be good for the region or the Gazans, but since when has Ahmadinejad and his crew cared about anybody but themselves?