B.T.'s Presence of mind is some kind of phenomenon. He apparently upset his mum by talking to her about how he felt. Its sad but understandable, once he was set on his retribution mission he would have realized that the muslim invaders would get their dues and his life would be forfeit, via the NZ ZOG. That would have been hard to supress that thought.
The muzzie terrorists have the experience and train their footsoldiers to suicide, Maybe this was a mistake on Tarrant's part.
They got his personal emails, unsurprising really. probably didnt need a backdoor hack, his fam would have been pressured to give it up.