Neither Jewish ethics nor Jewish tradition can disqualify terrorism as a means of combat.

We are very far from having any moral qualms as far as our national war goes. We have before us the command of the Torah, whose morality surpasses that of any other body of laws in the world: “Ye shall blot them out to the last man.” We are particularly far from having any qualms with regard to the enemy, whose moral degradation is universally admitted here. But first and foremost, terrorism is for us a part of the political battle being conducted under the present circumstances, and it has a great part to play: Speaking in a clear voice to the whole world, as well as to our wretched brethren outside this land, it proclaims our war against the occupier. The real terrorist hides behind his stacks of papers and of laws he himself legislated. [Our terrorism] is not aimed at persons, but rather at representatives, and therefore it is effective. If, in addition, it shakes the Jewish population out of its complacency, so much the better. Thus, and only thus, will the battle for liberation commence.

Yitzhak Shamir, LEHI, 1943