This (abandoning the Name) would be the normal suggested action.
I did wonder if the Hosts had in fact banned the Name but it remained as it had not been changed (An that I was keeping "Alive" by reporting).
As has been said the ID can be changed in some circumstances (Apple Issued IDs such a @mac.com and @me.com cannot along with some IDs linked to iCloud IDs).
However the "Nickname" as it is called on one page is accessible by the Hosts but not the Users
I can understand why Apple do not do this wholesale and basically wish the names were created once and once only.
The Software behind the Apple Support Communities is similar to that used by Facebook
Although Facebook does have a larger user base they do suffer from this problem
http://article.wn.com/view/2012/08/02/BBC_News_Facebook_has_more_than_83_million _fake_users/
I can understand that Apple would want to avoid similar percentages.
They have taken steps to make sure the "Reputation" system cannot be "gamed" to any great extent (people can create second and third (and more) accounts and respond to their own posts and the then award points)
At the same time I can see that people do not always see the notice to say it is permanent.
I also understand that a name that seems cool when you are 13 (youngest you can join) may not be as cool when you are fourteen or even 25
As regular posters we can only say what the current "Rules" are and what you can do the situation.
(mostly Abandon a lowly ranked name and create a new ID and Posting Alias)
And state that we or higher Ranked Poster can "report" the Post. (or the name itself).
20th July this happened
http://www.bbc.co.uk/news/world-us-canada-18921492
On the 22nd the Poster asked to change his name...
I saw this as a legitimate request.
Each post of this nature should be treated on it's merit.
9:45 PM Saturday; August 18, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Lion 10.7.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images."  No, Seriously