In all fairness, if you're so concerned with posting sensitive content, then why not create a throwaway account? It's easy on HN. You don't even need an e-mail address.
Why risk the magnificent foundation of HN (its comments) for something that can be mitigated so easily. I simply don't understand this. There have been so many comments that I've learned so much things from, I would be devastated if that were to go away or start to degrade.