Thanks for the insight. Really gives me a few new angles to think about.
In my experience (I dated a cutter and was friends with another) you're right, it's not a badge of courage. In fact, my girlfriend always wore long sleeve shirts or bracelets and wristbands. I have Chas in the front yard slicing away, and the rationale is that she never feels a sense of privacy. She always knows that her dad is in her head, and also her telepathic older sister. So fer it, it's "what the hell, why not. My thoughts are open to everyone anyway."
As for the dad, that gets more complicated. the irony is that he NEVER read his wife's mind. That's why he was unaware of the affair. He loved her so much, he respected her privacy. He would not read her mind without permission. As a result, he had no idea that his wife was cheating, and even more importantly, clinically depressed. He's a mind reader -- and as such isn't good at interpreting verbal communication and body language. He is wracked with guilt over this because his wife needed him desperately, and he was completely unaware of her internal suffering. So no, he did not kill his wife, she was married into a situation far beyond her comprehension, a mortal married to an off the charts ESPer, daughters with abilities that she could barely understand, and a husband who's deep respect made her feel isolated and misunderstood.
Thomas is not an evil guy. Just a very powerful intellect living amongst frail minds. He's been thoroughly screwed over by his country and best friend to boot. And the psychic molestation of his daughter is an attempt of a beaten, lonely man, desperately looking to regain the connection he had with his late wife. He's more pathetic than out and out evil. Basically, he's Jimmy Stewart in Vertigo crossed with Professor X.