I don't think Dr. A has been fairly treated with another ban.
He has clearly been goaded into anger by Randman, who uses his showcase forums to do just this.
Randman has a clear history of distortion, yet when pointing it out (albeit bluntly) Dr. A continues to come a cropper and Randman becomes ever more insufferable.
Given that the format clearly winds him up, why not just ban Dr.A from showcase fora?