I am in two minds on this issue.
I know in their indoctrinated state their minds are impenetrable and anything you do or say they will use against you as proof of their beliefs.
But, I also believe this so-called "persecution complex" response is just another way of shutting down discussion and anyone that dares to disagree with them. It's like "play by my rules - or else I'll scream persecution."
When in reality, the truth is, anyone who publicly peddles a belief system by way of unsolicited home visits needs to be questioned and challenged hard! Everytime - even if it makes them squirm and feel uncomfortable.