Are some people beyond help?

I swear some people just can’t understand things no matter how you explain it to them. It’s like they have a mental block that keeps them from thinking logically.
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I just tried to explain selective service to someone. And no amount of words would help that person understand that people still have to sign up for it. Just baffles me how some people are so ignorant despite the facts right in their face.
Are some people beyond help?
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