From dragonchild's post:

Most Wiccans would also say that if I give someone a knife, knowing they are capable of killing, and they use that knife to kill, I have committed harm. I vehemently disagree with this.

(emphasis mine) From robartes's post:

On the other hand, witholding our hypothetical murderer a knife does not equate to making a moral choice for him.

(emphasis also mine) We are all capable of murder, and we are all hypothetical murderers. Yet I am sure that if a guest comes to your home to eat steak, you hand them a knife, knowing that they may be capable of murder.

We're all capable of plenty of awful things. Trust is the hope that we won't do awful things. In the absence of direct information about intent, IMHO, information should be spread.