@Sturgis,
For a very intelligent man you have acted in an entirely predictable manner. This is the argument that all Israel apologists use; talk about something else. The Palestinian Solidarity Campaign is all about justice for the Palestinians, the end of the occupation of the West Bank, and the blockade of Gaza. It is not about Israel's right to exist, or the establishment of the state of Israel.
The persecution of the Palestinian people is indefensible. So apologists like yourself muddy the water by making it about something else. Your fellow apologist Foofie, has already alluded to the Holocaust, and spoken about Europe in the 1940's. At the same time conveniently ignoring the fact that Britain took no part in the Holocaust, and that British troops liberated Belsen.
If you had taught a humanities subject that had no absolutes, you may have found yourself in the position where you disagreed with your pupils but that did not mean your pupils were wrong. It's called opinion.