"Rogue state" is a designation used by the UK, USA and a few other countries to refer to a country which sponsors terrorism, has an authoritarian regime, severely restricts human rights and threatens world peace. In order to be a "rogue state" ALL these criteria must be met. Both the UK and USA see Iran as a rogue state (The USA classifies Sudan as rogue also, but I don't think the UK does). By contrast Zimbabwe is not a rogue state because it does not (significantly) threaten world peace. The description of Israel as a "rogue state" (as Turkey has done) is factually incorrect for a democracy with relatively decent human rights. The designation is deeply unhelpful in that it ratchets up the tension in an already tense situation. The Turkish political class are playing to a home audience which is increasingly pro-Islamic and anti-Western and to national shock at the deaths of Turks aboard the ships. They are playing for popular support in Turkey at the expense of peace in the Middle East.
We all want a solution in the Middle East. Calling Israel a "rogue state" is just ill-considered name calling, and makes that solution a little bit less likely.
Calling for an independent investigation is similarly a waste of time. I suggested above that no country allows its military to be investigated. The example of North Korea cited in response is not appropriate - North Korea did not throw open its records and invite the world to investigate the recent sinking. Examples of defeated nations - Serbia, the axis after 2WW - are precisely examples of defeated nations.
Obama has recently called the Gaza blockade "not sustainable". Of course this is right. But nor is opening the border and allowing Hamas to send rockets into Israel sustainable. Presumably the sustainable future is around regime change in Gaza. The genocidal ambitions of Hamas make them every bit as repugnant as every other genocidal group past and present, while the religious fanaticism of their demands for the "nullification" of Israel render them incredibly dangerous. Israel has acted wrongly (and indeed they should be brought to account) but Hamas has committed crimes on a new scale of evil. The biggest enemy of the Palestinian population of Gaza and to peace in the Middle East is the brutal, genocidal, terrorist-supporting Hamas government firmly committed to the murder of every Jew, men, women and children.