|Think about Loose Coupling|
<Twelve Step Program Joke>
Theo: Hi, I'm Theo, and I posted an answer to Perl Monks without getting the question.
Support Group: Hi, Theo!
</Twelve Step Program Joke>
And I got downvoted, lost some points and so on. Given that I'm 1) not that fragile and 2) aware of the fact that miscommunications happen all the time, I came back and answered other questions.
As to what should be done: if the poster has a point that he feels is worth archiving, he can post it as a stand-alone node. Assuming others agree, the new node will get votes and the poster will gain standing, both in XP and the more important community recoginition.
I think communities remember people for their good contributions, except when someone insistently and repeatedly makes bad contributions.