In so doing, there's a chance we could recreate here the original core of TC -- TC as it was in 2005/06, when it reported like a warm and enthusiastic newswire for all startups... before the pursuit of links and clicks led to all the pot-stirring, soap-opera, friends-and-enemies dross that now dominates TC.
Is banning TC necessarily the best solution? Maybe not, but we don't have another solution available that's doing the job. There might also be some throwing the baby out with the bathwater here, which seriously depends on how much TC is a source of news (for HN, specifically) that can't be had anywhere else. I'm not inclined to say that they are a significant source of such news for HN.
Similarly, one of Arrington's recommendations at the 2008 YC startup school was: if you want good coverage, leak us info so "we remember that down the road".
When there's a choice between two sources for the same story, I'd prefer the one where editorial judgment isn't driven by the constant filling and draining of a favor bank... even if that means using a source that's second-to-report.
(Otherwise, the situations where TC is truly a 'primary source', in the sense meant by a traditional journalist or historian, are not 'often' but rare.)