Might does not make right, but neither does impotence or relative weakness. That weakness does not justify strikes me as an important principle, but I have never seen it articulated. The Left tends to assume the opposite. They tend to assume that mightlessness makes right. I'll dub this the Converse Callicles Principle.
The power I have to kill you does not morally justify my killing you. In a slogan: Ability does not imply permissibility. My ability to kill, rape, pillage and plunder does not confer moral justification on my doing these things. But if you attack me with deadly force and I reply with deadly force of greater magnitude, your relative weakness does not supply one iota of moral justification for your attack, nor does it subtract one iota of moral justification from my defensive response. If I am justified in using deadly force against you as aggressor, then the fact that my deadly force is greater than yours does not (a) diminish my justification in employing deadly force, nor does it (b) confer any justification on your aggression.
Suppose a knife-wielding thug commits a home invasion and attacks a man and his family. The man grabs a semi-automatic pistol and manages to plant several rounds in the assailant, killing him. It would surely be absurd to argue that the disparity in lethality of the weapons involved diminishes the right of the pater familias to defend himself and his family. Weakness does not justify.
The principle that weakness does not justify can be applied to the Israeli-Hezbollah conflict from the summer of 2006 as well as to the current Israeli defensive operations against the terrorist entity, Hamas. The principle ought to be borne in mind when one hears leftists, those knee-jerk supporters of any and every 'underdog,' start spouting off about 'asymmetry of power' and 'disproportionality.' Impotence and incompetence are not virtues, nor do they confer moral justification or high moral status, any more than they confer the opposite.
The principle that mightlessness makes right seems to be one of the cardinal tenets of the Left. It is operative in the present furor over the enforcement of reasonable immigration laws in Arizona. To the south of the USA lies crime-ridden, corrupt, impoverished Mexico. For millions and millions it is a place to escape from. The USA, the most successful nation of all time, is the place to escape to. But how does this disparity in wealth, success, and overall quality of life justify the violation of the reasonable laws and the rule of law that are a good part of the reason for the disparity of wealth, success, and overall quality of life?