i dispute it because fundamentally the entire notion of some war being fought in a noble way relative to another is heinous. as though there are good wars which aren't so bad and the soldiers behave themselves. chomsky perpetuating the harmful myth of comparative "goodness" of wars alone is enough to indict his capacity for real thought and compassion, however in the context of the life he's lived and his personality, it goes a little deeper than that. he's using this fantasy of there being "worse wars" as a vessel of reactionary rhetoric. he has taken the worst thing man does and appropriated suffering as leverage for academic blustering. he's far from unique in this aspect, but that's not the point, now is it? this level of soulless disregard for the horrors of reality and willful naivete in an effort to maintain appearances of trite political dogmas is certainly precluded from having any kind of meaningful opinion on morality or ethics, full stop. it's an indication that he simply lacks the intellectual capacity along certain dimensions to even come to grips with the fundamentals.
Though this topic's domain is beside what I wrote; what is on the other end of said force does not matter. The moral burden is not alleviated because it stands in contrast of goodness from the same action. To kill is to kill. To enact terror through rape, pillaging and demolition cannot be washed away. They exist simultaneously to any hypothetical goodness and the two of them taken together cannot be reduced to a single value.
A life of no evil cannot be perpetuated from will alone. It can be lived, and possibly perpetuated in extremely narrow likelihoods, but not through force of will. If you would like to complain that this suggests it is unfair if you are to survive in this world, yes. Though I wouldn't call it unfair. Consider this, if it's a function of luck, it is truly the most fair thing of all. Far more than if it were simply left up to will, which gives a discriminatory advantage to those with better skills of utilizing and applying their will.
You simply need to accept that through your actions, you will not just be performing good things. You can certainly pursue a higher good, however if done carelessly this entails higher evils shifting into lock-step behind you.
I like to think of it like a system of feedback loops. A naive pursuit of lofty moral heights naturally creates a vacuum in its wake, where whorls of moral lows collect and aggregate. The reverse also holds true. Should we accept evil being done because it will spawn a great good to balance things out? Paying the cost up front. I find the idea no more absurd than the supposedly logical inverse. Perhaps the ultimate good was not to fight a war, but to recognize its increase in likelihood and defend against evil's manifestation in the first place in a less reactionary way. Failing to do this, we are left with a moral debt to pay. Playing games of gods and devils so to speak, it's like a finger trap puzzle. The more you struggle, the tighter you become bound.