You're not responsible for what someone else does, but you are responsible for what you do. If you accept a submission to your newspaper and publish it then you

You're not responsible for what someone else does, but you are responsible for what you do. If you accept a submission to your newspaper and publish it then you may be liable for any libelous claims because you are the one who published it. You think that HN is different because it automatically publishes anything anyone writes, but that perception isn't shared by many people who are old enough to remember a time before the World Wide Web.