When you submit a link to HN, is that an implicit statement that you agree with the content at the linked source, or are you inviting discussion of a source that you possibly disagree with? I have found some recent comment threads in which commenters presume that the submitter agrees with the linked content, but it seems to me under the HN guidelines,
"On-Topic: Anything that good hackers would find interesting. That includes more than hacking and startups. If you had to reduce it to a sentence, the answer might be: anything that gratifies one's intellectual curiosity."
it would be possible for someone to submit a link to invite discussion, without implying that the linked source is the last word (or even an adequate first word) on the subject.
What do you think? Does every link you submit come with your endorsement of truthfulness and accuracy?
Without the power to editorialize in the title, I don't think there's a good way to distinguish between submitting something that you agree with and submitting something that you would like to discuss, even though you disagree with it.
This is actually one reason why the anti-editorializing guideline makes sense. We really don't want HN to clog up with links to bad arguments that need refuting. There are far more bad articles than good ones, and the readers just don't have the time to sort them out for themselves. That's what HN is supposed to be doing for us! So we encourage people to submit only quality links, or suffer the consequences to their own reputation.
I think it's important to remember that HN isn't designed to replace blogs. If you want to start a critical discussion about some piece of content, write a blog post that criticizes it, then submit that blog post. That's what I would do.