Think about it. There's always an urge to have the "victim" not only be victimized by the act itself, but also be victimized by the fear created during the anticipation, and/or during the aftermath, by unsuspecting victims saying, "we should have known; the signs were all there."
I think that's only human nature, and that's why these warnings should be heeded. For instance, I am in the process of pursuing a job at another employer, and since the opportunity opened up, I have been trying to teach my boss/coworkers all the stuff that they should know to do for themselves but make me do for them anyway. In a perverse way, I take secret pleasure in knowing that after I leave, half will say "I'm so glad she taught me xyz," while the other half will say "I should have listened to her when she said I should learn this."