The whole defense industry leaves a bad taste in my mouth. Once you peel the narrative that we are supposed to be the good guys (hint: in some/most cases, we are not), you realize that you really just help to kill people.
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A lot of people will argue that defense companies want wars to break out to increase their business, but I don’t think that’s necessarily true. In wartime, the military mostly needs cheap commodities—ammunition, supplies, food, fuel—nothing you can really differentiate on. And especially the most recent wars have mostly been against poorly armed terrorists, when the defense industry makes a lot more money selling weapons that would be total overkill against the Taliban but potentially useful against Russia or China.