"My parents did nothing to deserve a malformed child, yet they were eschewed by their peers because I was born a twisted, mewling thing. My father lost his consular position because of me, even though his decruitment letter said nothing of my defects. He eventually found work in a sewage treatment plant. What a delicious irony: a man with a pardoner's education scooping through the faeces of his fellow humans.
"My mother was beaten into a coma by a group of puritan thugs as she stood waiting in line with a handful of tattered ration tickets. Before they drove her parietal bone into her brain, they called her a mutant-*****. She was twenty-two years old. Three dozen spectators stood in line and watched. Not one of them came forward to testify at the inquest. The magistrate ruled that the incident was an unfortunate example of Darwinism at work.
"Despite the harsh life that I have been forced into, I would not surrender any of my dubious 'gifts' for a semblance of your normalcy. Were I like you, I might also be full of self-righteous intolerance towards those who are otherwise unable to choose their own births, their own destinies. In that regard, I feel that I am more fortunate than you and your 'perfect' progeny.
"Remember that I am the product of your society's excesses, your wars, your sins. You can lock us away, you can flay the skin from our bodies, and you can declare us vermin and kill us like rats. Yet the time comes when you will be unable to ignore us any longer. Your Emperor be damned when my kind rises up to claim its rightful inheritance from the ashes of your pitiful Imperium."
— Cicero, mutant terrorist, prior to his execution
The above is one of my favorite pieces of writing that didn't make it into Dark Heresy. Gary Astleford wrote that for DH. At the time, it was considered to be far too sympathetic to the "bad guys".
How very delicious.
As many of you have already noted, people like to play the bad guys. The Tome of Corruption was one of the best sellers for WFRP 2nd and not just because folks wanted to have a book detailing NPC bad guys.