A Jew in the diaspora who actively supports Hamas bombing Sderot, should be denied the option to get Israeli citizenship automatically. And this goes for his family - wife and kids - too. They probably are against the notion of "Jewish state" anyway, which is based on the law of return, so they should agree with this. They might go on bragging of being denied Israeli citizenship, so in this sense its a win-win for both sides. Those on board who are already Israelis should be prosecuted according to Israeli law.
Jordanian MP says son joined ISIS, carried out suicide attack (AP)
from the article: Israel commandos 'peacefully' board Jewish Gaza-bound aid boat