They’re being downvoted because HN spends most of its time writing that JavaScript.
If you're making a content site then it should work without requiring Javascript. Or at least tell the user that they need to enable scripting, not that a random error has occurred.
Also they do tell the user they need to enable scripting, or at least that's what Google Translate tells me "Oeps, je hebt JavaScript nodig voor deze website" means.