Unfortunately posting more or less the same comment in many threads just makes other people do exactly the same thing in frustration and destroys the entire comment thread with copy-paste wars.
It's bad forum etiquette everywhere, not just on HN, and it ruins the conversation for everyone.
> When more than one person makes the same provably false claim
/shrug
Right or wrong regarding the content, you're not a one-person-army out there to single handedly defeat all the wrong-doers on HN.
If you're just here to tell people they're flat out wrong, rather than actually have a conversation, you're just spamming the thread.