Suggesting the defender in a war should just stop fighting, or that helping them is bad because if they did not have the ability to defend themselves, they’d quickly be unable to fight and the war would end with their defeat, is not anti-war. It is appeasement, and that is ultimately pro-war, because it creates a situation in which starting wars of aggression can benefit the ones who start them, which inevitably leads to more wars being started. To be against war, in the long term, one must support a situation in which starting wars is against the self-interest of those in the position to do so, and one of the clearest ways to do that is to try to ensure that those who begin wars of conquest or other such aggression, lose them.