Sure, it is sometimes impossible to know who posters are for 100% certainty.  However, why do we have to play deaf, dumb, and blind to what is all too obvious.  I think that it is insulting to everyone's intelligence on this forum.

On my brother Kerde's forum, AAA, he just refused someone posting rights because that person was a troll.

I think the MODs need to step up and boot the trolls quicker than they do.  It's almost sadistic on their part if they allow the same one or two revolving door access.