In other words it provides a coping mechanism for the potentially massive backlash, should it occur.
Think about it...you have no idea someone is lying to you, you suspect nothing. Suddenly you find out they were lying over an extended period of time. You are shocked to the core and very very confused and angry. You were totally unprepared.
OR you suspect that you may be being lied to. This enables you to allow sufficient detachment within yourself that when you find you were correct in your suspicions, your level of attachment to the person/situation is not as intense as it would have been had you been completely hoodwinked. therefore the damage to yourself is smaller, albeit slightly.
Being prepared can help in a situation like this.
I believe where there is reasonable cause for suspicion or unanswered questions, even in a wider situation and within a public interest case such as this, the same tactics are effective and for some, arguably necessary.