I think that Bush and Blair's big problem is that their justification of the war in Iraq is that it is possible to wipe out terrorists/guerilla fighters through superior military power. I am not sure what in history justifies this theory, but the result is that they have to back the Israeli government's belief that it is possible to get rid of terrorists with bombs. Personally, I imagine that many of the current terrorists were bread in the upheavals of 1982, and that the children being bombed today will be the terrorists of 2026.
To go off at a tangent, I read a theory in the papers that it was necessary for the Israeli government to fight back hard against any attacks if they were to get support from the Israeli people for support for withdrawal from the occupied territories i.e. withdrawal would only be acceptable if the Israelis could show that they would go so far and no further. I think they are now in an awful mess, but this does make sense to me.
On another tangent, I think it is very unhelpful to compare Zionists to Hitler. If anybody would like to talk imperialism I would refer them to British history up to about the 60's.