Some people do realize what an evil institution it is, a lot of them are pushed into the meat grinder from a very young age (entirely by design) and haven’t had a chance to shake their upbringing. There is a reason there is a fanatical hero worship of soldiers in the US. You also get the occasional people who actually step up to do the right thing like Hugh Thompson. Those are exceptionally few and far between though.
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Some people do realize what an evil institution it is, a lot of them are pushed into the meat grinder from a very young age (entirely by design) and haven’t had a chance to shake their upbringing. There is a reason there is a fanatical hero worship of soldiers in the US. You also get the occasional people who actually step up to do the right thing like Hugh Thompson. Those are exceptionally few and far between though.