Mark Colborne, 37, was found guilty in September of plotting a mass cyanide attack from his bedroom after a trial. Jurors heard he had felt "belittled" for being a white, ginger-haired male and had wanted to seek revenge. The Old Bailey court in London was told how Colborne had written about assassinating Prince Charles so that Prince Harry becomes king.
Sentencing Colborne today under the UK's Mental Health Act, Judge John Bevan said he was "clearly dangerous" and his "extraordinarily violent fantasies" were "seriously concerning".
He said: "You have been consumed with rage at disparate individuals and groups and you write in graphic terms of bombing and butchery. You are, I regret to say, a warped individual who in the past has held views of your fellow man which were repugnant to right-thinking people."
"Many people have unpleasant childhood memories, but they move on and grow up. Your extravagant self-pity has made your life a misery and your family's life a misery too," Bevan said. Under cross-examination, Colborne said the planned attacks were "angry rants" while he was off his medication for depression.
The court heard he was "sane" but had a personality disorder with a degree of psychosis which warranted continued treatment.