This is a poorly defined and inflammatory question.
It also seems to be a question with the obvious answer of “yes” from almost any perspective.
Once you decide on a moral system and a capacity for judgment—i.e., “vengeful general” or “concerned liberal citizen”—you could use standard brands of decision and probability theory to determine optimal actions—i.e., “go to war” or “vote against war”—but basically the only claim this entails is that “it is theoretically possible to think clearly when it comes to politics and wars” which is (hopefully) not a controversial (or, really, interesting) claim.
This is a poorly defined and inflammatory question.
It also seems to be a question with the obvious answer of “yes” from almost any perspective.
Once you decide on a moral system and a capacity for judgment—i.e., “vengeful general” or “concerned liberal citizen”—you could use standard brands of decision and probability theory to determine optimal actions—i.e., “go to war” or “vote against war”—but basically the only claim this entails is that “it is theoretically possible to think clearly when it comes to politics and wars” which is (hopefully) not a controversial (or, really, interesting) claim.