This comment doesn't actually disagree with the person at all, though. You're right, and they're right. We should be distrustful of veterans, but not because we're mystically superior beings who are just built different. We should be distrustful of them because they have a provably dangerous mindset, given all the murder.

So why does the distinction matter? Well, it wouldn't, if people wouldn't also keep bringing morality in the conversation. Once we start talking about some sort of abstract moral judge of character, the distinction becomes very important, because of ethical implications I'm too burnt out right now to explain.