People build planes, planes that fly, planes that fly and drop bombs. A machine that generates oppression is possible to turn up. A machine that turns down oppression seems plausible as well though might be more difficult in practice at times.
A peace sign is kind of an anti-oppression machine, low energy, easy to distribute, reminder peace making is less than ideal at times.
A machine or device that is really hard to change the battery, or one that has standard batteries, easy charging readily available? Access to add power easily factors into machines that are used more often, that have more throughput. And if one is creating an anti-oppression machine used more often, greater throughput is valuable.
A machine that unloads bombs from planes likely exist, though might be turned up less than those that actually put bombs onto planes. Thus, giving less momentum to situations that facilitate momentum towards war, bandwagon appeal towards war is valuable.
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Possibly find steps that lead up to military action and try to unwrap multiple steps up the chain reverse engineering to reduce momentum. Unstable financial climates and only parts of societies represented in talks have shown historic precedent for preceding wars.
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