BTGuy,
You are sloppily creating loshon hora and dan lekaf zcheus issues for all of us by not handling your suspicions behind the scenes with email warnings or waiting for a real problem.
From what I’ve seen, Jothar has been making a case for better protection of users’ identities by pointing out threads that might be problematic, not posters, and making general recommendations to not share PII or other seemingly innocent information that can be combined to make PII. I read more than I post, and I have seen several instances in the CR where a poster attempts (or threatens/claims to attempt) to harm another poster “IRL” after the latter poster revealed enough information online to provide an identity. One example was an attempt by “mosherose” to have another poster thrown out of a shiur in real life (see http://www.theyeshivaworld.com/coffeeroom/topic/changed-topic-of-shiur-do-i-have-a-right-to-be-disappointed). I don’t think such behavior is ok, do you?