In his manifesto, Norwegian killer Anders Behring Breivik listed Theodore Dalrymple among those whose writings inspired last month's massacre. Dalrymple here, here and here reflects on Breivik, the thinker's culpability and morality more generally. All worth reading. I very much liked this, from the second link, an interview of Dalrymple:
[I]f we understood each other perfectly, "we'd know exactly what each other are thinking—and that would be horrific," he insists. "At least if my thoughts are anything to go by."