Is it immoral to resist aggression or not to resist aggression?

An interesting question and Summer Patriot, Winter Soldier has an interesting article about it. Some excellent points especially about why Ghandi's campaign of passive resistance succeeded:

'because he knew that he did not face an aggressor who would destroy him in passivity, but because he knew that the english would respond to the moral suasion and historical and ethical argument he would bring to bear on them'

Why Israel cannot follow a similar course now:

'passive resistance did not serve european jews against the nazi's, nor the pogroms of eastern europe and the russians, ... , nor has it served the jews of israel against the transgressions and attacks of islamic arabia, nor will it serve the jews of israel against the rabid islamic islamic fundamentalism that sweeps turkey.'

And how 'the West' should react to provocation and attack...