From, A Penitent Blogger, a useful reminder:
The scary truth is that evil actions always have evil results even when there was not evil intent or when there was an impeccable excuse.
It should therefore be no surprise that the world around us is piled high with the evil effects of innumerable evil deeds - ours and others. Both the deliberate and the well-intentioned evils of humanity have woven a web of evil consequences that a thousand years of altruism alone could not undo.