Unless you are a total pacifist, saying you are “already against the next war” is a very simple-minded statement.
Wars are fought based on all kinds of different justifications. Some wars are bad, and others are necessary. (No war is ever “good,” of course.)
Lumping them all in one basket shows a real lack of discernment and good judgment. We need leaders who take these decisions seriously.
I make an exception to the “simple minded” statement for pacifists because, while I disagree with pacifism, it is not necessarily simple-minded to automatically oppose war.